UPD75238GJ NEC [NEC], UPD75238GJ Datasheet - Page 48

• Manufacturer Part Number: UPD75238GJ
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC [NEC]

48
(4) Pull-up resistor register group A (POGA)
Remark ——: Don’t care
Pull-up resistor register group A is a register to specify an internal pull-up register to each port pin of ports
0 to 3 and port 6 (excluding P00). Fig. 4-13 shows the format of this register.
When a pull-up resistor is to be contained, set 1 to an associated bit, and when a pull-up resistor is not
to be contained, set 0.
Caution For mask option, ports 4 and 5 can contain pull-up resistors, and port 7 and ports 10 to 15 can
Remark ——: Don’t care
Address
FDCH
Fig. 4-13 Format of the Register Group A Specifying the Use of Pull-Up Resistors
contain pull-down resistors bit by bit.
Address
Address
Symbol
Symbol
PMGA
PMGB
FECH
FE8H
—
7
PM63
PM7
PM3n, PM6n
PO6
7
7
6
Fig. 4-12 Formats of the Port Mode Registers
PMn
0
1
0
1
PM62
6
6
—
5
P3n and P6n pin I/O specification (n = 0-3)
Input mode (output buffers set off)
Output mode (output buffers set on)
Port n I/O specification (n = 2, 4, 5, and 7)
Input mode (output buffers set off)
Output mode (output buffers set on)
PM61
PM5
5
5
Port mode register group A
Port mode register group B
—
4
PM60
PM4
4
4
PO3
3
PM33
3
3
PO2
2
PM32
PM2
2
2
PO1
1
PM31
1
1
PO0
0
PM30
0
0
Symbol
POGA
Port 0 (P01 - P03)
Port 1 (P10 - P13)
Port 2 (P20 - P23)
Port 3 (P30 - P33)
Port 6 (P60 - P63)
Symbol
PMGA
Symbol
PMGB
PD75238