C541U Datasheet, PDF (20/63 Pages) Siemens Semiconductor Group – 8 BIT CMOS MICROCONTROLLER

C541U
Table 2
Special Function Registers - Functional Blocks (cont’d)
Block Symbol Name
Address Contents after
Reset
Pow.
Sav.
Modes
PCON
PCON1
Power Control Register
Power Control Register 1
87H
88H ⁴⁾
X00X0000B ²⁾
0XX0XXXXB ²⁾
USB
Module
EPSEL
USBVAL
ADROFF
GEPIR
DCR
DPWDR
DIER
DIRR
FNRL
FNRH
EPBCn ¹⁾
EPBSn ¹⁾
EPIEn ¹⁾
EPIRn ¹⁾
EPBAn ¹⁾
EPLENn ¹⁾
USBPWD⁴⁾
USBDCR ⁴⁾
USBDR0 ⁴⁾
USBDR1 ⁴⁾
USBDR2 ⁴⁾
USBDR3 ⁴⁾
USBDR4 ⁴⁾
USBDR5 ⁴⁾
USBDR6 ⁴⁾
USBDR7 ⁴⁾
USB Endpoint Select Register
D2H
USB Data Register
D3H
USB Address Offset Register
D4H
USB Global Endpoint Interrupt Request Reg. D6H
USB Device Control Register
C1H
USB Device Power Down Register
C2H
USB Device Interrupt Control Register
C3H
USB Device Interrupt Request Register
C4H
USB Frame Number Register, Low Byte
C6H
USB Frame Number Register, High Byte C7H
USB Endpoint n Buffer Control Register
C1H
USB Endpoint n Buffer Status Register
C2H
USB Endpoint n Interrupt Enable Register C3H
USB Endpoint n Interrupt Request Register C4H
USB Endpoint n Base Address Register
C5H
USB Endpoint n Buffer Length Register
C6H
USB Power Down Register
E6H
USB Control Register
E7H
USB Data Register 0
E8H
USB Data Register 1
E9H
USB Data Register 2
EAH
USB Data Register 3
EBH
USB Data Register 4
ECH
USB Data Register 5
EDH
USB Data Register 6
EEH
USB Data Register 7
EFH
80H
00H
00H ²⁾
00H
000X0000B
00H
00H
00H
XXH
00000XXXB
00H
20H
00H
10H ³⁾
00H
0XXXXXXXB
00H
00H
00H
00H
00H
00H
00H
00H
00H
00H
1) These register are multiple registers (n=0-4) with the same SFR address; selection of register “n“ is done by
SFR EPSEL.
2) The reset value of ADROFF is valid only if USBVAL has not been read or written since the last hardware reset.
3) The reset value of EPIR0 is 11_H.
4) These registers are only used in USB low-speed operation.
Semiconductor Group
18