C541U Datasheet, PDF (21/63 Pages) Siemens Semiconductor Group – 8 BIT CMOS MICROCONTROLLER

C541U
Table 3
Contents of the SFRs, SFRs in numeric order of their addresses
Addr Register Reset Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Value¹⁾
80H ²⁾ P0
FFH
.7
.6
.5
.4
.3
.2
.1
.0
81H SP
07H
.7
.6
.5
.4
.3
.2
.1
.0
82H DPL
00H
.7
.6
.5
.4
.3
.2
.1
.0
83H DPH
00H
.7
.6
.5
.4
.3
.2
.1
.0
86H WDTREL 00H
WDT .6
.5
.4
.3
.2
.1
.0
PSEL
87H PCON
X00X- –
0000B
PDS IDLS –
GF1 GF0 PDE IDLE
88H ²⁾ TCON 00H
TF1 TR1 TF0 TR0 IE1
IT1
IE0
IT0
88H PCON1 0XX0- EWPD –
–
WS –
–
–
–
2) 3)
XXXXB
89H TMOD 00H
GATE C/T M1
M0
GATE C/T M1
M0
8AH TL0
00H
.7
.6
.5
.4
.3
.2
.1
.0
8BH TL1
00H
.7
.6
.5
.4
.3
.2
.1
.0
8CH TH0
00H
.7
.6
.5
.4
.3
.2
.1
.0
8DH TH1
00H
.7
.6
.5
.4
.3
.2
.1
.0
90H²⁾ P1
FFH
.7
.6
SLS STO SRI SCLK LED1 LED0
93H SSCCON 07H
SCEN TEN MSTR CPOL CPHA BRS2 BRS1 BRS0
94H STB
XXH .7
.6
.5
.4
.3
.2
.1
.0
95H SRB
XXH .7
.6
.5
.4
.3
.2
.1
.0
96H SSCMOD 00H
LOOPB TRIO 0
0
0
0
0
LSBSM
9AH ITCON XXXX- –
–
–
–
I1ETF I1ETR I0ETF I0ETR
1010B
A0H²⁾ P2
FFH
.7
.6
.5
.4
.3
.2
.1
.0
A8H²⁾ IEN0
0XXX- EA
–
–
–
ET1 EX1 ET0 EX0
0000B
A9H IEN1
XXXX- –
–
–
–
–
EUDI EUEI ESSC
X000B
ABH SCF
XXXX- –
–
–
–
–
–
WCOL TC
XX00B
1) X means that the value is undefined and the location is reserved
2) Bit-addressable special function registers
3) SFR is located in the mapped SFR area. For accessing this SFR, bit RMAP in SFR SYSCON must be set.
Semiconductor Group
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