Nxp Semiconductors UM10310 User Manual
UM10310_1
© NXP B.V. 2008. All rights reserved.
User manual
Rev. 01 — 1 December 2008
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
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
and
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
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
for additional information. Combinations other than those
shown in
are reserved for future use should not be used.
1
FOSC1
2
FOSC2
3
BOE0
Brownout Detect Configuration (see
)