NXP Semiconductors P89LPC9321 UM10310 - Manual (Page 127)

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User manual Rev. 2 — 1 November 2010 127 of 139
NXP Semiconductors
UM10310
P89LPC9321 User manual
18.17 User configuration bytes
A number of user-configurable features of the P89LPC9321 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 and UCFG2 shown in
Table 112 and
Table 115 .
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 110. IAP function calls …continued
IAP function IAP call parameters
Table 111. Flash User Configuration Byte 1 (UCFG1) bit allocation
Bit 7 6 5 4 3 2 1 0
Symbol WDTE RPE BOE1 WDSE BOE0 FOSC2 FOSC1 FOSC0
Unprogrammed
value 0 1 1 0 0 0 1 1
Table 112. Flash User Configuration Byte 1 (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 113 are reserved for future use should not be used.
1 FOSC1
2 FOSC2
3 BOE0 Brownout Detect Configuration (see Section 5.1 “Brownout detection” )