P89C668HBA datasheet(49/54 Pages) PHILIPS

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Philips Semiconductors

Preliminary data

P89C668

80C51 8-bit Flash microcontroller family

64KB ISP Flash with 8KB RAM

2001 Jul 27

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 API calls

are shown in Table 10.

Using the Watchdog Timer (WDT)

The P89C668 supports 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 passed in R1 prior to calling PCM_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 running.

Table 10.

IAP calls

IAP CALL

PARAMETER

PROGRAM DATA BYTE

Input Parameters:

R0 = osc freq (integer)

R1 = 02h

R1 = 82h (WDT feed)

DPTR = address of byte to program

ACC = byte to program

Return Parameter

ACC = 00 if pass, !00 if fail

ERASE BLOCK

Input Parameters:

R0 = osc freq (integer)

R0 = 0 (Quick Erase)

R1 = 01h

R1 = 81h (WDT feed)

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

ERASE BOOT VECTOR

Input Parameters:

R0 = osc freq (integer)

R1 = 04h

R1 = 84h (WDT feed)

DPH = 00h

DPL = don’t care

Return Parameter

none

PROGRAM SECURITY BIT

Input Parameters:

R0 = osc freq (integer)

R1 = 05h

R1 = 85h (WDT feed)

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

PROGRAM STATUS BYTE

Input Parameters:

R0 = osc freq (integer)

R1 = 06h

R1 = 86h (WDT feed)

DPH = 00h

DPL = 00h – program status byte

ACC = status byte

Return Parameter

ACC = status byte

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