UPD78F0890GK(A)-GAJ-AX NEC, UPD78F0890GK(A)-GAJ-AX Datasheet - Page 100

• Manufacturer Part Number: UPD78F0890GK(A)-GAJ-AX
• Description: 8BIT MCU, 128K FLASH, 7K RAM, LQFP
• Manufacturer: NEC

Specifications of UPD78F0890GK(A)-GAJ-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 55
• Ram Memory Size: 7KB
• Cpu Speed: 20MHz
• No. Of Timers: 10
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

5.2.4 Port 4
using port mode register 4 (PM4). Use of an on-chip pull-up resistor can be specified in 1-bit units with pull-up resistor
option register 4 (PU4).
100
Port 4 is a 4-bit I/O port with an output latch. Port 4 can be set to the input mode or output mode in 1-bit units
Reset signal generation sets port 4 to input mode.
Figure 5-9 shows a block diagram of port 4.
P4:
PU4:
PM4:
RD:
WR××: Write signal
WR
WR
WR
RD
PORT
Port register 4
Pull-up resistor option register 4
Port mode register 4
Read signal
PM
PU
PU40 to PU43
PM40 to PM43
(P40 to P43)
Output latch
PM4
PU4
P4
Figure 5-9. Block Diagram of P40 to P43
CHAPTER 5 PORT FUNCTIONS
User’s Manual U17554EJ4V0UD
Selector
EV
DD
P-ch
P40 to P43