UPD78F9418A NEC, UPD78F9418A Datasheet - Page 72
UPD78F9418A
Manufacturer Part Number
UPD78F9418A
Description
(UPD7894xxA) 8-Bit Single Chip Microcontrollers
Manufacturer
NEC
Datasheet
1.UPD78F9418A.pdf
(319 pages)
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4.2 Configuration of Ports
4.2.1 Port 0
mode register 0 (PM0). When the P00 to P03 pins are used as input port pins, on-chip pull-up resistors can be
connected in 4-bit units by setting pull-up resistor option register 0 (PU0).
72
Control registers
Ports
Pull-up resistors
The ports consist of the following hardware.
This is a 4-bit I/O port with an output latch. Port 0 can be specified as input or output in 1-bit units by using port
Port 0 is set to input mode when the RESET signal is input.
Figure 4-2 shows a block diagram of port 0.
PU0: Pull-up resistor option register 0
PM:
RD:
WR:
Item
WR
WR
Port mode register
Port 0 read signal
Port 0 write signal
WR
RD
PORT
PU0
PM
PM00 to PM03
(P00 to P03)
Output latch
Port mode registers (PMm: m = 0, 2, 4, 5, 8, 9)
Pull-up resistor option registers (PUm: m = 0 to 2)
Total: 43 (input: 7, I/O: 36)
• Mask ROM version
• Flash memory version
PU00
Figure 4-2. Block Diagram of P00 to P03
Total: 36 (software control: 32, mask option control: 4)
Total: 32 (software control only)
Table 4-2. Configuration of Port
CHAPTER 4 PORT FUNCTIONS
User’s Manual U13952EJ3V0UD
Configuration
V
DD0
P-ch
P00 to P03
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