C541U Datasheet, PDF (23/63 Pages) Siemens Semiconductor Group – 8 BIT CMOS MICROCONTROLLER

C541U
Table 3
Contents of the SFRs, SFRs in numeric order of their addresses (cont’d)
Addr Register Reset Bit 7
Value¹⁾
EFH ⁷⁾ USBDR7 00H
.7
F0H²⁾ B
00H
.7
FCH ³⁾ VR0
4)
C5H 1
Bit 6
.6
.6
1
Bit 5
.5
.5
0
Bit 4
.4
.4
0
Bit 3
.3
.3
0
Bit 2
.2
.2
1
Bit 1
.1
.1
0
Bit 0
.0
.0
1
FDH VR1
C1H 1
1
0
0
0
0
0
1
3) 4)
FEH ³⁾ VR2
5)
4)
.7
.6
.5
.4
.3
.2
.1
.0
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.
4) These are read-only registers
5) The content of this SFR varies with the actual step of the C541U (e.g. 01_H for the first step)
6) The reset value of ADROFF is valid only if USBVAL has not been read or written since the last hardware reset.
7) These registers are only used in USB low-speed operation.
Semiconductor Group
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