p89lpc972fn NXP Semiconductors, p89lpc972fn Datasheet - Page 18
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p89lpc972fn
Manufacturer Part Number
p89lpc972fn
Description
8-bit Microcontroller With Accelerated Two-clock 80c51 Core 2kb/4 Kb/8 Kb Wide-voltage Byte-erasable ?ash
Manufacturer
NXP Semiconductors
Datasheet
1.P89LPC972FN.pdf
(65 pages)
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Table 5.
[1]
[2]
[3]
Name
BODCFG
CLKCON
CMPREF
RTCDATH Real-time
RTCDATL
Extended SFRs are physically located on-chip but logically located in external data memory address space (XDATA). The MOVX A,@DPTR and MOVX @DPTR,A instructions are
used to access these extended SFRs.
The BOICFG2/1/0 will be copied from UCFG1.5 to UCFG1.3 when power-on reset.
CLKCON register reset value comes from UCFG1. The reset value of CLKCON.2 to CLKCON.0 come from UCFG1.2 to UCFG1.0 and reset value of CLKDBL bit comes from
UCFG1.7.
Extended special function registers
Description
BOD
configuration
register
Clock control
register
Comparator
reference
register
clock data
register high
Real-time
clock data
register low
SFR addr. Bit functions and addresses
FFDEH
FFCBH
FFC8H
FFBFH
FFBEH
CLKOK
MSB
-
-
[1]
REFS5
-
-
WDMOD
REFS4
-
XTALWD
REFS3
-
CLKDBL
-
-
BOICFG2
FOSC2
REFS2
BOICFG1
FOSC1
REFS1
BOICFG0
FOSC0
REFS0
LSB
Reset value
Hex
[2]
[3]
00
00
00
Binary
1000 xxxx
0000 0000
0000 0000
0000 0000
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