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Part: MC68HC11A7
Category:
Description:
Company: Motorola Semiconductor Products
Datasheet: Download MC68HC11A7 datasheet File size : 2455 kB
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SingleChip Microcontrollers (AMCU)
In Brief . . .
Motorola offers the most comprehensive selection of highperformance singlechip control systems available from a single source. Microcontroller device families range from industrystandard 8bit controllers to stateoftheart 16 and 32bit modular controllers. Within the price and performance categories of each family, there are a variety of onchip capabilities to match specific applications. Motorola device families are structured so that upward migration need not involve complete code development. The M68HC11 Family is upward code compatible with M6800 and M6801 software, while the M68HC16 family is sourcecode compatible with the M68HC11 family. Motorola's newest 8bit MCU product line, the M68HC08 family, is fully upward object code compatible with the M68HC05 and M6805 families. In addition, M68300 and M68HC16 devices share standard internal modules and bus configurations. Page M68HC11 Family . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.62 Modular Microcontroller . . . . . . . . . . . . . . . . . . . . . . . . 2.612 The M68HC16 Family . . . . . . . . . . . . . . . . . . . . . . . 2.614 The M68300 Family . . . . . . . . . . . . . . . . . . . . . . . . . 2.619 Development Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.623 Fuzzy Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.626 OnLine Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.626 ThirdParty Support . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.627
Motorola Master Selection Guide
2.61
Single-Chip Microcontrollers (AMCU)
M68HC11 Family
The M68HC11 Family incorporates a flexible central processing unit and a large number of controloriented onchip peripherals. M68HC11 MCU are upward code compatible with M6800, M6801, and M68HC05 software. eight input channels, and most offer 8bit resolution, although some provide 10bit resolution. A 2 channel, 8bit D/A is also available.
Central Processing Unit
The M68HC11 CPU is optimized for low power consumption and highperformance operation at bus frequencies up to 4 MHz. Key features include: · Two 8bit or one 16bit accumulator · Two 16bit index registers · Powerful bitmanipulation instructions · Six powerful addressing modes · Immediate, Extended, Direct, Indexed, Inherent, and Relative · Power saving STOP and WAIT modes · Memory mapped I/O and special functions · 16x16 Integer and Fractional Divides · 8x8 Multiply
PulseWidth Modulation
Some M68HC11 Family members have up to six channels of 8bit PWM. At a 4 MHz bus frequency, signals can be produced from 40 KHz to less than 10 Hz. PWM signals with a period greater than one minute are possible in the 16bit mode.
Serial Communication
All members of the M68HC11 Family include a Serial Peripheral Interface (SPI) and a Serial Communications Interface (SCI). These onchip peripherals are designed to minimize CPU intervention during data transfer. · The SCI is a full duplex UARTtype asynchronous system that uses standard NonReturntoZero (NRZ) data format. An onchip Baud rate generator derives standard rates from the microcontroller oscillator. Both transmitter and receiver are double buffered. · The SPI is a fourwire synchronous communications interface used for highspeed communication with specialized peripheral devices and other microcontrollers. Data is transmitted and received simultaneously; the Baud rate is software programmable.
Timer
M68HC11 timer architecture is based on a 16bit free running counter driven through a softwareprogrammable prescaler. Features include multiple Input Captures, Output Compares, RealTime Interrupt, Pulse Accumulator, and Watchdog functions.
OnChip Memory
Since its introduction, the M68HC11 Family has provided versatile combinations of popular memory technologies, including the first EEPROM on a CMOS microcontroller. The family has a memory option to fit virtually any application. · ROM sizes range from 0 to 32K bytes. ROM is typically factory programmed to contain custom software. ROMless versions of most M68HC11 Family members are also available. · RAM sizes range from 192 bytes to 1.25K bytes. M68HC11 RAM utilizes a fully static design, and all devices feature a standby power supply pin for battery backup of RAM contents. · EPROM sizes range from 4K to 32K bytes. EPROM is especially suited to prototype development and small production runs. EPROM versions are available in both windowed and OTP packaging. · EEPROM sizes range from 0 to 2K bytes. EEPROM is ideal for storage of calibration, diagnostic, data logging, and security information. Each M68HC11 device with EEPROM includes an onchip charge pump to facilitate singlesupply programming and erasing.
Digital I/O and Special Functions
M68HC11 Family I/O is extremely flexible, allowing pins to be configured to match application requirements. Most I/O lines are controlled by bits in a Data Direction Register (DDR) which can configure pins for either input or output. Most lines have a dedicated port data latch. Some M68HC11 Family members include a 4channel Direct Memory Access (DMA) and a Memory Management Unit (MMU). The DMA provides fast data transfer between memories and registers, and includes externally mapped memory in the expanded mode. The MMU allows up to 1 megabyte of address space in a physical 64 kbyte allocation. Integrated chip selects help to reduce glue logic. Several members of the M68HC11 Family also include programmable chip select circuits. These circuits can be used to enable external peripherals whenever an access to a predefined block of memory addresses is made. These circuits help to reduce external logic requirements.
Math Coprocessor
New M68HC11 Family members offer a 16bit onchip math coprocessor that accelerates multiply and divide operations by as much as 10 times. The coprocessor functions independently of the CPU and requires no special instructions. The coprocessor is wellsuited to lowbandwidth DSP functions such as closed loop control, servo positioning, and signal conditioning.
DigitaltoAnalog Conversion
The M68HC11 Family provides powerful, onchip, multichannel A/D converter systems. Multiconversion and multichannel options allow single or continuous conversion on single or multiple channels. M68HC11 A/D systems have
Single-Chip Microcontrollers (AMCU)
2.62
Motorola Master Selection Guide
PULSE ACCUMULATOR ROM8K BYTES TIMER CC1
PERIODIC INTERRUPT RAM256 BYTES COP WATCHDOG
PAI OC2 OC3 OC4 OC5 IC1 IC2 IC3 SS SCK MOSI MISO TxD RxD
PA7 PA6 PA5 PA4 PA3 PA2 PA1 PA0 PD5 PD4 PD3 PD2 PD1 PD0
PE7 PE6 PE5 PE4 PE3 PE2 PE1 PE0 VRH VRL RESET XIRQ IRQ
SCI PORT E
A/D CONVERTER M68HC11 CPU
ADDRESS/DATA BUS INTERRUPTS HANDSHAKE I/O
PORT D
EEPROM512 BYTES
SPI
DATA DIRECTION D
PORT A
XTAL EXTAL E
OSCILLATOR DATA DIRECTION C PORT B POWER PORT C
MODA (LIR) MODB (VSTBY)
PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0
PB7 PB6 PB5 PB4 PB3 PB2 PB1 PB0
STRB STRA R/W AS
MODE SELECT VDD VSS
AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0
A15 A14 A13 A12 A11 A10 A9 A8
EXPANDED
Figure 1. MC68HC11A8 Block Diagram
Motorola Master Selection Guide
2.63
Single-Chip Microcontrollers (AMCU)
PARALLEL I/O EQUIVALENT TO MC68HC24 SINGLE CHIP
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