p87c51mc2 NXP Semiconductors, p87c51mc2 Datasheet - Page 12

• Manufacturer Part Number: p87c51mc2
• Description: 80c51 8-bit Microcontroller Family With Extended Memory
• Manufacturer: NXP Semiconductors

Special Function Registers (Continued)
Notes:
* SFRs are bit addressable.
# SFRs are modified from or added to the 80C51 SFRs.
‡ Extended SFRs accessed by preceeding the instruction with 51MX escape (opcode A5h).
- Reserved bits, must be written with 0’s.
& Power on reset is 10H. Other reset is 00H.
§ BRGR1 and BRGR0 must only be written if BRGEN in BRGCON SFR is ’0’. If any of them is written if BRGEN = 1, result is
% The unimplemented bits (labeled ’-’) in the SFRs are ’X’s (unknown) at all times. ’1’s should NOT be written to these bits, as
2001 Apr 06
Philips Semiconductors
TCON*
T2CON#*
T2MOD#
TH0
TH1
TH2
TL0
TL1
TL2
TMOD
WDTRST# Watchdog Timer Reset
WDCON#
SYMBOL
80C51 8-bit microcontroller family with extended memory
64KB/96KB OTP with 2KB/3KB RAM
unpredictable.
they may be used for other purposes in future derivatives. The reset values shown for these bits are ’0’s although they are
unknown when read.
Timer Control Register
Timer2 Control Register
Timer2 Mode Control
Timer 0 High
Timer 1 High
Timer 2 High
Timer 0 Low
Timer 1 Low
Timer 2 Low
Timer 0 and 1 Mode
Watchdog Timer Control
DESCRIPTION
ADDRESS
DIRECT
8FH
CDH
CCH
C8H
C9H
8CH
8DH
8AH
8BH
A6H
88H
89H
‡
GATE
MSB
TF1
CF
TF2
8F
-
-
BIT ADDRESS, SYMBOL, OR ALTERNATE PORT FUNCTION
EXF2
TR1
C/T
CE
8E
-
-
12
RCLK
TF0
CD
M1
8D
-
-
TCLK
TR0
CC
M0
8C
-
-
GATE
EXEN2
CB
8B
IE1
-
-
P87C51MB2/P87C51MC2
WDPRE2 WDPRE1 WDPRE0
TR2
C/T
8A
CA
IT1
-
T2OE
C/T2
IE0
C9
M1
89
Preliminary specification
CP/RL2
DCEN
LSB
C8
M0
88
IT0
Reset
Value
00H
00H
FFH
00H
00H
00H
00H
00H
00H
00H
00H
00H
%
%