
76
EPSON
S1C88409 TECHNICAL MANUAL
CHAPTER 5: PERIPHERAL CIRCUITS AND OPERATION (Output Ports)
5.7.5 I/O memory of output ports
Table 5.7.5.1 shows the output port control bits.
Table 5.7.5.1(a) Output port control bits
Address
Function
R/W
Init
0
1
Comment
Name
Bit
00FFD0
R07 high impedance control register
R06 high impedance control register
R05 high impedance control register
R04 high impedance control register
R03 high impedance control register
R02 high impedance control register
R01 high impedance control register
R00 high impedance control register
R/W
1
Comple-
mentary
High
impedance
HZR07
HZR06
HZR05
HZR04
HZR03
HZR02
HZR01
HZR00
D7
D6
D5
D4
D3
D2
D1
D0
00FFD1
R17 high impedance control register
R16 high impedance control register
R15 high impedance control register
R14 high impedance control register
R13 high impedance control register
R12 high impedance control register
R11 high impedance control register
R10 high impedance control register
R/W
1
Comple-
mentary
High
impedance
HZR17
HZR16
HZR15
HZR14
HZR13
HZR12
HZR11
HZR10
D7
D6
D5
D4
D3
D2
D1
D0
00FFD2
R27 high impedance control register
R26 high impedance control register
R25 high impedance control register
R24 high impedance control register
R23 high impedance control register
R22 high impedance control register
R21 high impedance control register
R20 high impedance control register
R/W
1
Comple-
mentary
High
impedance
HZR27
HZR26
HZR25
HZR24
HZR23
HZR22
HZR21
HZR20
D7
D6
D5
D4
D3
D2
D1
D0
00FFD3
–
R32 high impedance control register
R31 high impedance control register
R30 high impedance control register
–
R/W
–
1
–
Comple-
mentary
–
High
impedance
"0" when being read
–
HZR32
HZR31
HZR30
D7
D6
D5
D4
D3
D2
D1
D0
00FFD4
–
R42 high impedance control register
R41 high impedance control register
R40 high impedance control register
–
R/W
–
1
–
Comple-
mentary
–
High
impedance
"0" when being read
–
HZR42
HZR41
HZR40
D7
D6
D5
D4
D3
D2
D1
D0
00FFD5
R07 output port data register
R06 output port data register
R05 output port data register
R04 output port data register
R03 output port data register
R02 output port data register
R01 output port data register
R00 output port data register
R/W
1
Low
High
R07D
R06D
R05D
R04D
R03D
R02D
R01D
R00D
D7
D6
D5
D4
D3
D2
D1
D0
00FFD6
R17 output port data register
R16 output port data register
R15 output port data register
R14 output port data register
R13 output port data register
R12 output port data register
R11 output port data register
R10 output port data register
R/W
1
Low
High
R17D
R16D
R15D
R14D
R13D
R12D
R11D
R10D
D7
D6
D5
D4
D3
D2
D1
D0