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Pin Functions
Chapter 2
Preliminary User’s Manual U17566EE1V2UM00
2.4.13
Port group 9
Port group 9 is an 8-bit port group. In alternative mode, it comprises pins for
the following functions:
• LCD Bus Interface data lines (DBD0 to DBD7)
• LCD controller segment signal output (SEG36 to SEG39) (µPD70(F)3420,
µPD70(F)3421, µPD70(F)3422, µPD70F3423 only)
• LCD controller common signal output (COM0 to COM4) (µPD70(F)3420,
µPD70(F)3421, µPD70(F)3422, µPD70F3423 only)
Port group 9 includes the following pins:
Note
Though DBD0-7 is a bidirectional bus PMnm must be set to "0", i.e. to output
mode, when the port is used as LCD bus I/F bus DBD0-7. The change of the
direction is performed automatically, when data is read from the external bus.
Access
All 8-bit registers can be accessed in 8-bit or 1-bit units.
Table 2-40
Port group 9: pin functions and port types
Pin functions in different modes
Pin function
after reset
Port type
Port mode
(PMCnm = 0)
Alternative mode
(PMCnm = 1)
LCD mode
(PLCDCnm = 1)
a
Output mode
(PMnm = 0)
Input mode
(PMnm = 1)
P90 (I/O)
DBD0
–
SEG36
a
P90 (I)
M
P91 (I/O)
DBD1
–
SEG37
a
P91 (I)
M
P92 (I/O)
DBD2
–
SEG38
a
P92 (I)
M
P93 (I/O)
DBD3
–
SEG39
a
P93 (I)
M
P94 (I/O)
DBD4
–
COM0
a
P94 (I)
M
P95 (I/O)
DBD5
–
COM1
a
P95 (I)
M
P96 (I/O)
DBD6
–
COM2
a
P96 (I)
M
P97 (I/O)
DBD7
–
COM3
a
P97 (I)
M
a)
µPD70(F)3420, µPD70(F)3421, µPD70(F)3422, µPD70F3423 only
Table 2-41
Port group 9: configuration registers
Register
Address
Initial
value
Used bits
PM9
FFFF F432
H
FF
H
PM97
PM96
PM95
PM94
PM93
PM92
PM91
PM90
PMC9
FFFF F452
H
00
H
PMC97
PMC96
PMC95
PMC94
PMC93
PMC92
PMC91
PMC90
PLCDC9
a
a)
µPD70(F)3420, µPD70(F)3421, µPD70(F)3422, µPD70F3423 only
FFFF F352
H
00
H
PLCDC97
PLCDC96
PLCDC95
PLCDC94
PLCDC93
PLCDC92
PLCDC91
PLCDC90
P9
FFFF F412
H
00
H
P97
P96
P95
P94
P93
P92
P91
P90
PPR9
FFFF F3D2
H
00
H
PPR97
PPR96
PPR95
PPR94
PPR93
PPR92
PPR91
PPR90
PDSC9
FFFF F312
H
00
H
PDSC97
PDSC96
PDSC95
PDSC94
PDSC93
PDSC92
PDSC91
PDSC90
PICC9
FFFF F392
H
00
H
PICC97
PICC96
PICC95
PICC94
PICC93
PICC92
PICC91
PICC90
PODC9
FFFF F372
H
00
H
PODC97
PODC96
PODC95
PODC94
PODC93
PODC92
PODC91
PODC90
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