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| C541U Datasheet, PDF (19/63 Pages) Siemens Semiconductor Group – 8 BIT CMOS MICROCONTROLLER | |||
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C541U
Table 2
Special Function Registers - Functional Blocks
Block Symbol Name
Address Contents after
Reset
CPU
ACC
B
DPH
DPL
PSW
SP
VR0
VR1
VR2
SYSCON
Accumulator
B Register
Data Pointer, High Byte
Data Pointer, Low Byte
Program Status Word Register
Stack Pointer
Version Register 0
Version Register 1
Version Register 2
System Control Register
E0H 1)
F0H 1)
83H
82H
D0H 1)
81H
FCH
FDH
FEH
B1H
00H
00H
00H
00H
00H
07H
C5H
C1H
YYH 3)
XX10XXXXB 2)
Interrupt
System
IEN0
IEN1
IP0
IP1
ITCON
Interrupt Enable Register 0
A8H1)
Interrupt Enable Register 1
A9H
Interrupt Priority Register 0
B8H 1)
Interrupt Priority Register 1
B9H)
External Interrupt Trigger Condition Register 9AH
0XXX0000B 2)
XXXXX000B 2)
XXXX0000B 2)
XXXXX000B 2)
XXXX1010B 2)
Ports
P0
P1
P2
P3
Port 0
Port 1
Port 2
Port 3
80H 1)
90H 1)
A0H 1)
B0H 1)
FFH
FFH
FFH
FFH
Timer 0 /
Timer 1
TCON
TH0
TH1
TL0
TL1
TMOD
Timer 0/1 Control Register
Timer 0, High Byte
Timer 1, High Byte
Timer 0, Low Byte
Timer 1, Low Byte
Timer Mode Register
88H 1)
00H
8CH
00H
8DH
00H
8AH
00H
8BH
00H
89H
00H
SSC
Interface
SSCCON
STB
SRB
SCF
SCIEN
SSCMOD
SSC Control Register
SSC Transmit Buffer
SSC Receive Register
SSC Flag Register
SSC Interrupt Enable Register
SSC Mode Test Register
93H 1)
94H
95H
ABH 1)
ACH
96H
07H
XXH 2)
XXH 2)
XXXXXX00B 2)
XXXXXX00B 2)
00H
Watchdog WDCON Watchdog Timer Control Register
WDTREL Watchdog Timer Reload Register
C0H 1)
86H
XXXX0000B 2)
00H
1) Bit-addressable special function registers
2) âXâ means that the value is undefined and the location is reserved
3) The content of this SFR varies with the actual of the step C541U (eg. 01H for the first step)
4) This SFR is located in the mapped SFR area. For accessing this SFR, bit RMAP in SFR SYSCON must be
set.
Semiconductor Group
17
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