P89C668 datasheet(66/89 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

The ISP facility was designed so that specific crystal frequencies

were not required in order to generate baud rates or time the

programming pulses. The user thus needs to provide the

P89C660/662/664/668 with information required to generate the

proper timing. Record type 02 is provided for this purpose.

Table 14.

Intel-Hex Records Used by In-System Programming

RECORD TYPE

COMMAND/DATA FUNCTION

Program Data

:nnaaaa00dd....ddcc

Where:

= number of bytes (hex) in record

Aaaa

= memory address of first byte in record

dd....dd

= data bytes

= checksum

Example:

:10008000AF5F67F0602703E0322CFA92007780C3FD

End of File (EOF), no operation

:xxxxxx01cc

Where:

xxxxxx

= required field, but value is a “don’t care”

= checksum

Example:

:00000001FF

Specify Oscillator Frequency

:01xxxx02ddcc

Where:

xxxx

= required field, but value is a “don’t care”

= integer oscillator frequency rounded down to nearest MHz

= checksum

Example:

:0100000210ED

(dd = 10h = 16, used for 16.0–16.9 MHz)

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