Philips P89LPC938, User Manual

Page: 130 / 139

© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
User manual Rev. 03 — 7 June 2005 130 of 139
Philips Semiconductors
UM10119
P89LPC938 User manual
19.17 User configuration bytes
A number of user-configurable features of the P89LPC938 must be defined at power-up
and therefore cannot be set by the program after start of execution. These features are
configured through the use of an Flash byte UCFG1 shown in
Table 116
Read Sector CRC Input parameters:
ACC = 05h
R7= sector address
Return parameter(s):
R4= CRC bits 31:24
R5= CRC bits 23:16
R6= CRC bits 15:8
R7= CRC bits 7:0 (if no error)
R7= error status (if error)
Carry= set on error, clear on no error
Read Global CRC Input parameters:
ACC = 06h
Return parameter(s):
R4= CRC bits 31:24
R5= CRC bits 23:16
R6= CRC bits 15:8
R7= CRC bits 7:0 (if no error)
R7= error status (if error)
Carry= set on error, clear on no error
Read User Code Input parameters:
ACC = 07h
R4= address (MSB)
R5= address (LSB)
Return parameter(s):
R7= data
Table 114: IAP function calls
…continued
IAP function IAP call parameters
Table 115: Flash User Configuration Byte (UCFG1) bit allocation
Bit 7 6 5 4 3 2 1 0
Symbol WDTE RPE BOE WDSE - FOSC2 FOSC1 FOSC0
Unprogrammed
value 0 1 1 0 0 0 1 1
Table 116: Flash User Configuration Byte (UCFG1) bit description
Bit Symbol Description
0 FOSC0 CPU oscillator type select. See Section 2 “Clocks” for additional information. Combinations other than those
shown in Table 117 are reserved for future use should not be used.
1 FOSC1
2 FOSC2
3 - reserved