P89C668 datasheet(69/89 Pages) PHILIPS

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Philips Semiconductors

Product data

P89C660/P89C662/P89C664/

P89C668

80C51 8-bit Flash microcontroller family

16KB/32KB/64KB ISP/IAP Flash with 512B/1KB/2KB/8KB RAM

2002 Oct 28

In Application Programming Method

Several In Application Programming (IAP) calls are available for use

by an application program to permit selective erasing and

programming of Flash sectors. All calls are made through a common

interface, PGM_MTP. The programming functions are selected by

setting up the microcontroller’s registers before making a call to

PGM_MTP at FFF0H. The oscillator frequency is an integer number

rounded down to the nearest megahertz. For example, set R0 to 11

for 11.0592 MHz. Results are returned in the registers. The IAP calls

are shown in Table 15.

Using the Watchdog Timer (WDT)

The 89C66x devices support the use of the WDT in IAP. The user

specifies that the WDT is to be fed by setting the most significant bit

of the function parameter passed in R1 prior to calling PGM_MTP.

The WDT function is only supported for Block Erase when using the

Quick Block Erase. The Quick Block Erase is specified by

performing a Block Erase with register R0 = 0. Requesting a WDT

feed during IAP should only be performed in applications that use

the WDT since the process of feeding the WDT will start the WDT if

the WDT was not working.

Table 15.

IAP calls

IAP CALL

PARAMETER

PROGRAM DATA BYTE

Input Parameters:

R0 = osc freq (integer)

R1 = 02h

R1 = 82h (WDT feed, Rx2 & 66x only)

DPTR = address of byte to program

ACC = byte to program

Return Parameter

ACC = 00 if pass, !00 if fail

Sample routine:

;***** Program Device Data (DData) *****

;***** ACC holds data to write

;***** DPTR holds address of byte to write *****

;***** Returns with ACC = 00h if successful, else ACC NEQ 00h

WRData:

MOV

AUXR1,#20H

;set the ENBOOT bit

MOV

R0, #11

;FOSC

MOV

R1,#02H

;program data function

MOV

A,Mydata

;data to write

MOV

DPTR,Address

;specify address of byte to read

CALL

PGM_MTP

;execute the function

RET

ERASE BLOCK

Input Parameters:

R0 = osc freq (integer)

R0 = 0 (QUICK ERASE, Rx2 & 66x only)

R1 = 01h

R1 = 81h (WDT feed, Rx2 & 66x only; can only be used with Quick Erase)

DPH = block code as shown below:

block 0,

0k to

8k, 00H

block 1,

8k to 16k, 20H

block 2, 16k to 32k, 40H

block 3, 32k to 48k, 80H

block 4, 48k to 64k, C0H

DPL = 00h

Return Parameter

none

Sample routine:

;***** Erase Code Memory Block *****

;***** DPH (7:5) indicates which of the 5 blocks to erase

;***** DPTR values for the blocks are:

;

0000h = block 0

;

2000h = block 1

;

4000h = block 2

;

8000h = block 3

;

C000h = block 4

ERSBLK:

MOV

AUXR1,#20H

;set the ENBOOT bit

MOV

R0, #11

;FOSC

MOV

R1,#01H

;erase block

MOV

DPTR,#BLk_NUM

;specify which block

CALL

PGM_MTP

;execute the function

RET

P89C668 Datasheet(PDF) 69 Page - NXP Semiconductors

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