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52 EPSON S1C88650 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (Output Ports)
5.6.4 Control of output ports
Table 5.6.4.1 shows the output port control bits.
Table 5.6.4.1(a) Output port control bits
SR R/WAddress Bit Name Function Comment10
00FF70 D7
D6
D5
D4
D3
D2
D1
D0
–
–
–
–
HZR1H
HZR1L
HZR0H
HZR0L
R/W register
R/W register
R/W register
R/W register
R14–R17 high impedance control
R10–R13 high impedance control
R04–R07 high impedance control
R00–R03 high impedance control
Reserved register
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
1
1
1
1
High
impedance
0
0
0
0
Comple-
mentary
Reserved register
00FF71 D7
D6
D5
D4
D3
D2
D1
D0
–
–
HZR25
HZR24
HZR23
HZR22
HZR21
HZR20
R/W register
R/W register
R25 high impedance control
R24 high impedance control
R23 high impedance control
R22 high impedance control
R21 high impedance control
R20 high impedance control
0
0
0
R/W
R/W
R/W
1
1
High
impedance
0
0
Comple-
mentary
D7
D6
D5
D4
D3
D2
D1
D0
Reserved register
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
1
1
1
1
High
impedance
0
0
0
0
Comple-
mentary
00FF72 –
–
–
–
HZR33
HZR32
HZR31
HZR30
R/W register
R/W register
R/W register
R/W register
R33 high impedance control
R32 high impedance control
R31 high impedance control
R30 high impedance control
00FF74 D7
D6
D5
D4
D3
D2
D1
D0
R17D
R16D
R15D
R14D
R13D
R12D
R11D
R10D
1 R/W
High Low
00FF75 D7
D6
D5
D4
D3
D2
D1
D0
–
–
R25D
R24D
R23D
R22D
R21D
R20D
00FF73 D7
D6
D5
D4
D3
D2
D1
D0
R07D
R06D
R05D
R04D
R03D
R02D
R01D
R00D
R07 output port data
R06 output port data
R05 output port data
R04 output port data
R03 output port data
R02 output port data
R01 output port data
R00 output port data
1 R/W
High Low
R17 output port data
R16 output port data
R15 output port data
R14 output port data
R13 output port data
R12 output port data
R11 output port data
R10 output port data
Reserved register
R/W register
R/W register
R25 output port data
R24 output port data
R23 output port data
R22 output port data
R21 output port data
R20 output port data
0
0
1
R/W
R/W
R/W
1
1
High
0
0
Low