upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 62

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

4.2.1 Port 0
using port mode register 0 (PM0). When the P00 and P01 pins are used as an input port, use of an on-chip pull-up
resistor can be specified in 1-bit units by pull-up resistor option register 0 (PU0).
62
Port 0 is a 2-bit I/O port with an output latch. Port 0 can be set to the input mode or output mode in 1-bit units
This port can also be used for timer I/O.
Reset signal generation sets port 0 to input mode.
Figures 4-2 and 4-3 show block diagrams of port 0.
P0:
PU0:
PM0:
RD:
WR××: Write signal
WR
WR
WR
RD
PORT
PU
PM
Port register 0
Pull-up resistor option register 0
Port mode register 0
Read signal
Alternate function
Output latch
PM00
PU0
PU00
(P00)
PM0
P0
Figure 4-2. Block Diagram of P00
Preliminary User’s Manual U19014EJ1V0UD
CHAPTER 4 PORT FUNCTIONS
EV
DD
P-ch
P00/TI000