C501_1 Datasheet, PDF (26/121 Pages) Siemens Semiconductor Group – 8-Bit Single-Chip Microcontroller

Memory Organization
C501
Table 3-3
Contents of the SFRs, SFRs in numeric order of their addresses
Addr Register Content Bit 7
after
Reset¹⁾
Bit 6
80H²⁾ P0
81H SP
82H DPL
83H DPH
87H PCON
88H²⁾ TCON
89H TMOD
8AH TL0
8BH TL1
8CH TH0
8DH TH1
90H²⁾ P1
98H²⁾ SCON
99H SBUF
A0H²⁾ P2
A8H²⁾ IE
B0H²⁾ P3
B8H²⁾ IP
C8H²⁾ T2CON
FFH
07H
00H
00H
0XXX-
0000B
00H
00H
00H
00H
00H
00H
FFH
00H
XXH
FFH
0X00-
0000B
FFH
XX00-
0000B
00H
.7
.6
.7
.6
.7
.6
.7
.6
SMOD –
TF1
GATE
.7
.7
.7
.7
.7
SM0
.7
.7
EA
TR1
C/T
.6
.6
.6
.6
.6
SM1
.6
.6
–
RD WR
–
–
TF2 EXF2
Bit 5
.5
.5
.5
.5
–
TF0
M1
.5
.5
.5
.5
.5
SM2
.5
.5
ET2
T1
PT2
RCLK
Bit 4
.4
.4
.4
.4
–
TR0
M0
.4
.4
.4
.4
.4
REN
.4
.4
ES
T0
PS
TCLK
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
PT1
INT0
PX1
EXEN2 TR2
C9H T2MOD XXXX- –
–
–
–
–
–
XXX0B
CAH RC2L 00H
.7
.6
.5
.4
.3
.2
CBH RC2H 00H
.7
.6
.5
.4
.3
.2
CCH TL2
00H
.7
.6
.5
.4
.3
.2
CDH TH2
00H
.7
.6
.5
.4
.3
.2
1) X means that the value is undefined and the location is reserved
2) Bit-addressable special function registers
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
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
Semiconductor Group
3-5