Electronics America Single-Chip Microcontrollers User's Manual

CHAPTER 3 CPU ARCHITECTURE
User’s Manual U15331EJ4V1UD 63
Table 3-4. Special Function Registers (1/3)
Bit Unit for ManipulationAddress Special Function Register (SFR) Name Symbol R/W
1 Bit 8 Bits 16 Bits
After
Reset
FF00H Port 0 P0
√ √ −
FF01H Port 1 P1
√ √ −
FF02H Port 2 P2
√ √ −
FF03H Port 3 P3
√ √ −
FF05H Port 5 P5
R/W
√ √ −
FF06H Port 6 P6
√ √ −
FF07H Port 7
Note
P7
R
√ √ −
FF08H Port 8
Note
P8 R/W
√ √ −
00H
FF0AH 8-bit compare register 61 CR61 W
− √ −
Undefined
FF0BH 8-bit timer counter 61 TM61 R
− √ −
00H
FF0CH 8-bit compare register 60 CR60
− √
FF0DH 8-bit compare register 50 CR50
CR6 W
− √
√
Undefined
FF0EH 8-bit timer counter 60 TM60
− √
FF0FH 8-bit timer counter 50 TM50
TM6 R
− √
√
FF11H Serial I/O shift register 1A0 SIO1A0 R/W
− √ −
00H
FF12H 16-bit multiplication result store register L MUL0L
− √
FF13H 16-bit multiplication result store register H MUL0H
MUL0
− √
√
Undefined
FF14H
FF15H
A/D conversion result register 0 ADCRL0
R
− − √
0000H
FF16H
FF17H
16-bit compare register 20 CR20 W
− − √
FFFFH
FF18H
FF19H
16-bit timer counter 20 TM20
− − √
0000H
FF1AH
FF1BH
16-bit capture register 20 TCP20
R
− − √
Undefined
FF20H Port mode register 0 PM0
√ √ −
FF21H Port mode register 1 PM1
√ √ −
FF22H Port mode register 2 PM2
√ √ −
FF23H Port mode register 3 PM3
√ √ −
FF25H Port mode register 5 PM5
√ √ −
FF28H Port mode register 8
Note
PM8
√ √ −
FFH
FF30H Pull-up resistor option register B0 PUB0
√ √ −
FF31H Pull-up resistor option register B1 PUB1
√ √ −
FF32H Pull-up resistor option register B2 PUB2
√ √ −
FF33H Pull-up resistor option register B3 PUB3
R/W
√ √ −
00H
Note When used as port function by mask option or port function register.