C501 Datasheet, PDF (18/48 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

C501
Table 3
Contents of the SFRs, SFRs in numeric order of their addresses
Addr Register Content Bit 7
after
Reset¹⁾
Bit 6
Bit 5
Bit 4
80H²⁾ P0
FFH
.7
.6
.5
.4
81H SP
07H
.7
.6
.5
.4
82H DPL
00H
.7
.6
.5
.4
83H DPH
00H
.7
.6
.5
.4
87H PCON 0XXX- SMOD –
–
–
0000B
88H ²⁾ TCON 00H
TF1 TR1 TF0 TR0
89H TMOD 00H
GATE C/T M1
M0
8AH TL0
00H
.7
.6
.5
.4
8BH TL1
00H
.7
.6
.5
.4
8CH TH0
00H
.7
.6
.5
.4
8DH TH1
00H
.7
.6
.5
.4
90H²⁾ P1
FFH
.7
.6
.5
.4
98H²⁾ SCON 00H
SM0 SM1 SM2 REN
99H SBUF XXH .7
.6
.5
.4
A0H²⁾ P2
FFH
.7
.6
.5
.4
A8H²⁾ IE
0X00- EA
–
0000B
ET2 ES
B0H²⁾ P3
FFH
RD
WR T1
T0
B8H²⁾ IP
XX00. –
–
PT2 PS
0000B
C8H²⁾ T2CON 00H
TF2 EXF2 RCLK TCLK
C9H T2MOD XXXX- –
–
–
–
XXX0B
CAH RC2L 00H
.7
.6
.5
.4
CBH RC2H 00H
.7
.6
.5
.4
CCH TL2
00H
.7
.6
.5
.4
CDH TH2
00H
.7
.6
.5
.4
D0H²⁾ PSW
00H
CY
AC
F0
RS1
E0H²⁾ ACC
00H
.7
.6
.5
.4
F0H²⁾ B
00H
.7
.6
.5
.4
1) X means that the value is undefined and the location is reserved
2) Bit-addressable special function registers
Bit 3 Bit 2
.3
.2
.3
.2
.3
.2
.3
.2
GF1 GF0
IE1 IT1
GATE C/T
.3
.2
.3
.2
.3
.2
.3
.2
.3
.2
TB8 RB8
.3
.2
.3
.2
ET1 EX1
INT1 INT0
PT1 PX1
EXEN2 TR2
–
–
.3
.2
.3
.2
.3
.2
.3
.2
RS0 OV
.3
.2
.3
.2
Bit 1
.1
.1
.1
.1
PDE
IE0
M1
.1
.1
.1
.1
.1
TI
.1
.1
ET0
TxD
PT0
C/T2
–
.1
.1
.1
.1
F1
.1
.1
Bit 0
.0
.0
.0
.0
IDLE
IT0
M0
.0
.0
.0
.0
.0
RI
.0
.0
EX0
RxD
PX0
CP/RL2
DCEN
.0
.0
.0
.0
P
.0
.0
Semiconductor Group
18
1997-04-01