Philips Semiconductors Product specification
8XC54/58
8XC51FA/FB/FC/80C51FA
8XC51RA+/RB+/RC+/RD+/80C51RA+
80C51 8-bit microcontroller family
8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),
low power, high speed (33MHz)
2000 Aug 07
11
Table 2. 8XC51FA/FB/FC, 8XC51RA+/RB+/RC+/RD+ Special Function Registers
SYMBOL DESCRIPTION
DIRECT
ADDRESS
BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION
MSB LSB
RESET
VALUE
ACC* Accumulator E0H E7 E6 E5 E4 E3 E2 E1 E0 00H
AUXR# Auxiliary 8EH – – – – – –
EXTRAM
(RX+ only)
AO xxxxxx00B
AUXR1# Auxiliary 1 A2H – – – LPEP
3
GF3 0 – DPS xxx0xxx0B
B* B register F0H F7 F6 F5 F4 F3 F2 F1 F0 00H
CCAP0H# Module 0 Capture High FAH xxxxxxxxB
CCAP1H# Module 1 Capture High FBH xxxxxxxxB
CCAP2H# Module 2 Capture High FCH xxxxxxxxB
CCAP3H# Module 3 Capture High FDH xxxxxxxxB
CCAP4H# Module 4 Capture High FEH xxxxxxxxB
CCAP0L# Module 0 Capture Low EAH xxxxxxxxB
CCAP1L# Module 1 Capture Low EBH xxxxxxxxB
CCAP2L# Module 2 Capture Low ECH xxxxxxxxB
CCAP3L# Module 3 Capture Low EDH xxxxxxxxB
CCAP4L# Module 4 Capture Low EEH xxxxxxxxB
CCAPM0# Module 0 Mode DAH – ECOM CAPP CAPN MAT TOG PWM ECCF x0000000B
CCAPM1# Module 1 Mode DBH – ECOM CAPP CAPN MAT TOG PWM ECCF x0000000B
CCAPM2# Module 2 Mode DCH – ECOM CAPP CAPN MAT TOG PWM ECCF x0000000B
CCAPM3# Module 3 Mode DDH – ECOM CAPP CAPN MAT TOG PWM ECCF x0000000B
CCAPM4# Module 4 Mode DEH – ECOM CAPP CAPN MAT TOG PWM ECCF x0000000B
DF DE DD DC DB DA D9 D8
CCON*# PCA Counter Control D8H CF CR – CCF4 CCF3 CCF2 CCF1 CCF0 00x00000B
CH# PCA Counter High F9H 00H
CL# PCA Counter Low E9H 00H
CMOD# PCA Counter Mode D9H CIDL WDTE – – – CPS1 CPS0 ECF 00xxx000B
DPTR: Data Pointer (2 bytes)
DPH Data Pointer High 83H 00H
DPL Data Pointer Low 82H 00H
AF AE AD AC AB AA A9 A8
IE* Interrupt Enable A8H EA EC ET2 ES ET1 EX1 ET0 EX0 00H
BF BE BD BC BB BA B9 B8
IP* Interrupt Priority B8H – PPC PT2 PS PT1 PX1 PT0 PX0 x0000000B
B7 B6 B5 B4 B3 B2 B1 B0
IPH# Interrupt Priority High B7H – PPCH PT2H PSH PT1H PX1H PT0H PX0H x0000000B
87 86 85 84 83 82 81 80
P0* Port 0 80H AD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 FFH
97 96 95 94 93 92 91 90
P1* Port 1 90H CEX4 CEX3 CEX2 CEX1 CEX0 ECI T2EX T2 FFH
A7 A6 A5 A4 A3 A2 A1 A0
P2* Port 2 A0H AD15 AD14 AD13 AD12 AD11 AD10 AD9 AD8 FFH
B7 B6 B5 B4 B3 B2 B1 B0
P3* Port 3 B0H RD WR T1 T0 INT1 INT0 TxD RxD FFH
PCON#
1
Power Control 87H SMOD1 SMOD0 – POF
2
GF1 GF0 PD IDL 00xx0000B
* SFRs are bit addressable.
# SFRs are modified from or added to the 80C51 SFRs.
– Reserved bits.
1. Reset value depends on reset source.
2. Bit will not be affected by Reset.
3. LPEP – Low Power OTP–EPROM only operation.