|Category||Microcontrollers => CISC->8051/80C51 Family->EEPROM/Flash|
|Description||8-bit Microcontroller With 32k Bytes Quickflash(tm)|
|Datasheet||Download AT87F51RC-20PI datasheet
Compatible with MCS-51TM Products 32K Bytes of One-time Programmable QuickFlashTM Memory to 6V Operating Range Fully Static Operation: to 24 MHz Three-level Program Memory Lock x 8-bit Internal RAM 32 Programmable I/O Lines Three 16-bit Timer/Counters Eight Interrupt Sources Programmable Serial Channel Low-power Idle and Power-down Modes Interrupt Recovery from Power-down Hardware Watchdog Timer Dual Data Pointer Power-off FlagDescription
The is a low-power, high-performance CMOS 8-bit microcomputer with 32K bytes of QuickFlash one-time programmable (OTP) read only memory and 512 bytes of RAM. The device is manufactured using Atmel's high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 and 80C52 instruction set and pinout. The on-chip QuickFlash allows the program memory to be
user programmed by a conventional nonvolatile memory programmer. A total of 512 bytes of internal RAM are available in the AT87F51RC. The 256-byte expanded internal RAM is accessed via MOVX instructions after clearing bit 1 in the SFR located at address 8EH. The other 256-byte RAM segment is accessed the same way as the Atmel
AT89-series and other 8052-compatible products. By combining a versatile 8-bit CPU with QuickFlash on a monolithic chip, the Atmel is a powerful microcomputer which provides a highly-flexible and costeffective solution to many embedded control applications.
PSEN ALE/PROG EA / VPP RST PORT 1 LATCH PORT 3 LATCH TIMING AND CONTROL INSTRUCTION REGISTER DUAL DPTR
The AT87F51RC provides the following standard features: 32K bytes of QuickFlash, 512 bytes of RAM, 32 I/O lines, three 16-bit timer/counters, a six-vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT87F51RC is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. The Power-down mode saves the RAM contents but freezes the oscillator, disabling all other chip functions until the next external interrupt or hardware reset. Port 2 Port an 8-bit bidirectional I/O port with internal pullups. The Port 2 output buffers can sink/source four TTL inputs. When 1s are written to Port 2 pins, they are pulled high by the internal pullups and can be used as inputs. As inputs, Port 2 pins that are externally being pulled low will source current (IIL) because of the internal pullups. Port 2 emits the high-order address byte during fetches from external program memory and during accesses to external data memory that use 16-bit addresses (MOVX @ DPTR). In this application, Port 2 uses strong internal pullups when emitting 1s. During accesses to external data memory that use 8-bit addresses (MOVX @ RI), Port 2 emits the contents of the P2 Special Function Register. Port 2 also receives the high-order address bits and some control signals during QuickFlash programming and verification. Port 3 Port an 8-bit bidirectional I/O port with internal pullups. The Port 3 output buffers can sink/source four TTL inputs. When 1s are written to Port 3 pins, they are pulled high by the internal pullups and can be used as inputs. As inputs, Port 3 pins that are externally being pulled low will source current (IIL) because of the pullups. Port 3 also serves the functions of various special features of the AT87F51RC, as shown in the following table. Port 3 also receives some control signals for QuickFlash programming and verification.
Port Pin P3.6 P3.7 Alternate Functions RXD (serial input port) TXD (serial output port) INT0 (external interrupt 0) INT1 (external interrupt 1) T0 (timer 0 external input) T1 (timer 1 external input) WR (external data memory write strobe) RD (external data memory read strobe)
VCC Supply voltage. GND Ground. Port 0 Port an 8-bit open drain bidirectional I/O port. As an output port, each pin can sink eight TTL inputs. When 1s are written to port 0 pins, the pins can be used as highimpedance inputs. Port 0 can also be configured to be the multiplexed loworder address/data bus during accesses to external program and data memory. In this mode, P0 has internal pullups. Port 0 also receives the code bytes during QuickFlash programming and outputs the code bytes during program verification. External pullups are required during program verification. Port 1 Port an 8-bit bidirectional I/O port with internal pullups. The Port 1 output buffers can sink/source four TTL inputs. When 1s are written to Port 1 pins, they are pulled high by the internal pullups and can be used as inputs. As inputs, Port 1 pins that are externally being pulled low will source current (IIL) because of the internal pullups. In addition, P1.0 and P1.1 can be configured to be the timer/counter 2 external count input (P1.0/T2) and the timer/counter 2 trigger input (P1.1/T2EX), respectively, as shown in the following table. Port 1 also receives the low-order address bytes during QuickFlash programming and verification.
Port Pin P1.0 P1.1 Alternate Functions T2 (external count input to Timer/Counter 2), clock-out T2EX (Timer/Counter 2 capture/reload trigger and direction control)
RST Reset input. A high on this pin for two machine cycles while the oscillator is running resets the device. This pin drives High for 96 oscillator periods after the Watchdog times out. The DISRTO bit in SFR AUXR (address 8EH) can be used to disable this feature. In the default state of bit DISTRO, the RESET HIGH out feature is enabled. ALE/PROG Address Latch Enable is an output pulse for latching the low byte of the address during accesses to external
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