UPD75518 NEC, UPD75518 Datasheet - Page 48

• Manufacturer Part Number: UPD75518
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC

48
(a) Port mode register group A
(b) Port mode register group B
(c) Port mode register group C
Note To develop a program, these bits must be set to 0. They correspond to PM8 and PM15. While this
Address
FE8H
Address
FECH
Address
FEEH
chip is an input-only device, an emulator has I/O ports.
PM63 PM62 PM61 PM60 PM33
—
PM7
7
7
7
Note
PM14 PM13 PM12 PM11
—
6
6
6
0
1
PM5
5
5
5
Input mode (Output buffer off)
Output mode (Output buffer on)
PM4
Fig. 4-9 Formats of Port Mode Registers
4
4
4
Contents of specification
—
3
3
3
PM32
PM10
PM2
2
2
2
PM31
PM9
—
1
1
1
PM30
—
0
0
—
0
Note
Symbol
PMGA
P30 I/O specification
P31 I/O specification
P32 I/O specification
P33 I/O specification
P60 I/O specification
P61 I/O specification
P62 I/O specification
P63 I/O specification
Symbol
PMGB
Port 2 (P20 - P23) I/O specification
Port 4 (P40 - P43) I/O specification
Port 5 (P50 - P53) I/O specification
Port 7 (P70 - P73) I/O specification
Symbol
PMGC
Port 9 (P90 - P93) I/O specification
Port 10 (P100 - P103) I/O specification
Port 11 (P110 - P113) I/O specification
Port 12 (P120 - P123) I/O specification
Port 13 (P130 - P133) I/O specification
Port 14 (P140 - P143) I/O specification
PD75518(A)