P89C668 datasheet(73/89 Pages) PHILIPS

73 / 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

READ SECURITY BITS

Input Parameters:

R0 = osc freq (integer)

R1 = 07h

R1 = 87h (WDT feed, Rx2 & 66x only)

DPH = 00h

DPL = 00h (security bits)

Return Parameter

ACC = value of byte read

Sample routine:

;*****reads the Security Bits (SBits) *****

;***** SBits returned in ACC (2:0)

RDSBits:

MOV

AUXR1,#20H

;set the ENBOOT bit

MOV

R0,#11

;FOSC

MOV

R1,#07H

;read misc function

MOV

DPTR,#0000H

;specify security bits

CALL

PGM_MTP

;execute the function

RET

READ STATUS BYTE

Input Parameters:

R0 = osc freq (integer)

R1 = 07h

R1 = 87h (WDT feed, Rx2 & 66x only)

DPH = 00h

DPL = 01h (status byte)

Return Parameter

ACC = value of byte read

Sample routine:

;*****reads the Status Byte (SB) *****

;***** SB returned in ACC

RDSB:

MOV

AUXR1,#20H

;set the ENBOOT bit

MOV

R0,#11

;FOSC

MOV

R1,#07H

;read misc function

MOV

DPTR,#0001H

;specify status byte

CALL

PGM_MTP

;execute the function

RET

READ BOOT VECTOR

Input Parameters:

R0 = osc freq (integer)

R1 = 07h

R1 = 87h (WDT feed, Rx2 & 66x only)

DPH = 00h

DPL = 02h (boot vector)

Return Parameter

ACC = value of byte read

Sample routine:

;*****reads the Boot Vector (BV) *****

;***** BV returned in ACC

RDBV:

MOV

AUXR1,#20H

;set the ENBOOT bit

MOV

R0,#11

;FOSC

MOV

R1,#07H

;read misc function

MOV

DPTR,#0002H

;specify boot vector

CALL

PGM_MTP

;execute the function

RET

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