Details, datasheet, quote on part number: AN91009
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Features, Applications

1. INTRODUCTION A set of software functions is given to access the E2PROM on the 8xC851 microcontrollers. These functions can be called from application programs written in assembly, or C. The functions are found in the E2PROM.OBJ file that can be linked to the application program. The driver is written and tested with the following software tools from BSO-Tasking: Assembler: (OM4144) C Comp.: V2.0 (OM4136) Debugger: V1.4c (OM4129) Resources used by driver: Exclusive use of 1 register bank (default RB1) Accumulator PSW 1 static bit addressable RAM byte 2. FUNCTION DESCRIPTIONS The functions that use write and/or erase actions are interrupt driven except for E2PROM_wr_byte_pol. The application can check the status of these actions by testing the flag E2PROM_BUSY. This flag is available via the function E2PROM_status. In the 8xC851, the E2PROM interrupt is combined with the UART interrupt. To enable the E2PROM interrupt, EA (in the IE-register) must be set (should be done in application program), the combined UART/E2PROM enable bit must be set (ES in the IE-register, done with function E2PROM_int_en) and the E2PROM interrupt enable bit (EEINT in ECNTRL register) must be set. The E2PROM interrupt flag is automatically set by functions that use erase/write actions. This means that the UART interrupt enable cannot be disabled while the E2PROM interrupt is completely enabled. The E2PROM can be disabled separately with the E2PROM_int_dis function. The priority level for UART and E2PROM interrupt are the same and are defined with the E2PROM_int_en function. The E2PROM driver has a link to a UART interrupt handler. When a UART interrupt occurs, the status of the controller is pushed on the stack and then interrupt flags are tested to determine the source of the interrupt. When the source of the interrupt is the UART, then subroutine _UART_HDL is called. the implementation of the UART interrupt handler is done by the user. On the disk a file UART.SRC is available that contains this subroutine. This routine will only clear the trx-interrupt flag (TI) and rcv-interrupt flag (RI).

2.1 E2PROM_init Function description: This function must be called before any of the other functions is called. The timing register for writing/erasing the E2PROM is initialized and the register bank that the E2PROM functions can use is defined. The default registerbank is RB1; the ETIM register which determines the write/erase timing is default initialized with 0x7B (XTAL 12MHz). If other values are required, the parameters REGISTERBANK and XTAL must be changed in the equate list of the source file (E2PROM.ASM). The E2PROM/UART interrupt is enabled and set to priority level `0'. Calling Sequence: E2PROM_init(); Function prototype: void E2PROM_init (void) Parameters: None

2.2 E2PROM_int_en Function description: This function will enable the E2PROM/UART interrupt. The global enable bit EA is not effected and must be controlled by the application program. The priority level of the E2PROM/UART is controlled by the parameter `Pr_Level'. Calling Sequence: E2PROM_int_en (Pr_Level); Function prototype: void E2PROM_int_en (data char Pr_Level) Parameters: Pr_Level: This parameter determines the priority level on which the E2PROM/UART interrupts are handled. Values greater than 0x01 will be interpreted as 0x01.

2.3 E2PROM_int_dis Function description: This function will disable the E2PROM/UART interrupt. Calling Sequence: E2PROM_Int_Dis; Function prototype: void E2PROM_Int_Dis (void) Parameters: None


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