P89C668 datasheet(70/89 Pages) PHILIPS

70 / 89 page

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

IAP CALL

PARAMETER

ERASE BOOT VECTOR &

STATUS BYTE

Input Parameters:

R0 = osc freq (integer)

R1 = 04h

R1 = 84h (WDT feed, Rx2 & 66x only)

DPH = 00h

DPL = don’t care

Return Parameter

none

Sample routine:

;***** Erase Boot Vector (BV) & Status Byte (SB) *****

;***** Note: This command erases BOTH the SB & BV

ERSBBV;

MOV

AUXR1,#20H

;set the ENBOOT bit

MOV

R0, #11

;FOSC

MOV

R1,#04H

;erase status byte & boot vector

MOV

DPH,#00h

;we don’t care about DPL

CALL

PGM_MTP

;execute the function

RET

PROGRAM SECURITY BIT

Input Parameters:

R0 = osc freq (integer)

R1 = 05h

R1 = 85h (WDT feed, Rx2 & 66x only)

DPH = 00h

DPL = 00h – security bit # 1 (inhibit writing to Flash)

01h – security bit # 2 (inhibit Flash verify)

02h – security bit # 3 (disable external memory)

Return Parameter

none

Sample routines:

;***** Program Security Bit1 *****

;***** DPTR indicates security bit to program *****

WRSB1:

MOV

AUXR1,#20H

;set the ENBOOT bit

MOV

R0,#11

;FOSC

MOV

R1,#05H

;program security bit function

MOV

DPTR,#0000h

;specify security bit 1

CALL

PGM_MTP

;execute the function

RET

;***** Program Security Bit2 *****

;***** DPTR indicates security bit to program *****

WRSB2:

MOV

AUXR1,#20H

;set the ENBOOT bit

MOV

R0,#11

;FOSC

MOV

R1,#05H

;program security bit function

MOV

DPTR,#0001h

;specify security bit 2

CALL

PGM_MTP

;execute the function

RET

;***** Program Security Bit3 *****

;***** DPTR indicates security bit to program *****

WRSB3:

MOV

AUXR1,#20H

;set the ENBOOT bit

MOV

R0,#11

;FOSC

MOV

R1,#05H

;program security bit function

MOV

DPTR,#0002h

;specify security bit 3

CALL

PGM_MTP

;execute the function

RET

P89C668 Datasheet(PDF) 70 Page - NXP Semiconductors

P89C668 Datasheet(HTML) 70 Page - NXP Semiconductors

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