CHAPTER 3 CPU ARCHITECTURE
User's Manual U11919EJ3V0UM00
58
Table 3-4. Special Function Registers (1/2)
Bit Units for Manipulation
Address
Special Function Register (SFR) Name
Symbol
R/W
1 Bit
8 Bits
16 Bits
After Reset
FF00H
Port 0
P0
Ο
Ο
−
FF01H
Port 1
P1
Ο
Ο
−
FF02H
Port 2
P2
Ο
Ο
−
FF03H
Port 3
P3
Ο
Ο
−
FF04H
Port 4
P4
Ο
Ο
−
FF05H
Port 5
P5
R/W
Ο
Ο
−
00H
Transmit shift register 00
TXS00
W
−
Ο
−
FFH
FF10H
Receive buffer register 00
RXB00
SIO00
R
−
Ο
−
Undefined
FF16H
FF17H
16-bit compare register 20
CR20
W
−
Ο
Note 1
Ο
Note 2
FFFFH
FF18H
FF19H
16-bit timer counter 20
TM20
−
Ο
Note 1
Ο
Note 2
0000H
FF1AH
FF1BH
16-bit capture register 20
TCP20
R
−
Ο
Note 1
Ο
Note 2
Undefined
FF20H
Port mode register 0
PM0
Ο
Ο
−
FF21H
Port mode register 1
PM1
Ο
Ο
−
FF22H
Port mode register 2
PM2
Ο
Ο
−
FF23H
Port mode register 3
PM3
Ο
Ο
−
FF24H
Port mode register 4
PM4
Ο
Ο
−
FF25H
Port mode register 5
PM5
Ο
Ο
−
FFH
FF42H
Timer clock select register 2
TCL2
R/W
−
Ο
−
00H
FF50H
8-bit compare register 00
CR00
W
−
Ο
−
Undefined
FF51H
8-bit timer counter 00
TM00
R
−
Ο
−
FF53H
8-bit timer mode control register 00
TMC00
Ο
Ο
−
FF5BH
16-bit timer mode control register 20
TMC20
Ο
Ο
−
FF70H
Asynchronous serial interface mode
register 00
ASIM00
R/W
Ο
Ο
−
FF71H
Asynchronous serial interface status
register 00
ASIS00
R
Ο
Ο
−
FF72H
Serial operation mode register 00
CSIM00
Ο
Ο
−
FF73H
Baud rate generator control register 00
BRGC00
R/W
−
Ο
−
00H
Notes 1. CR20, TM20, and TCP20 are designed for 16-bit access. They can also be accessed in 8-bit mode,
however. In 8-bit access mode, use direct addressing.
2. 16-bit access is allowed only with short direct addressing.
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Содержание UPD789026 Series
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