upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 64

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

4.2.2 Port 1
using port mode register 1 (PM1). When the P10 to P17 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 1 (PU1).
64
Port 1 is an 8-bit I/O port with an output latch. Port 1 can be set to the input mode or output mode in 1-bit units
This port can also be used for serial interface data I/O, clock I/O, and timer I/O.
Reset signal generation sets port 1 to input mode.
Figures 4-4 to 4-9 show block diagrams of port 1.
Caution To use P10/SCK10 and P12/SO10 as general-purpose ports, set serial operation mode register 10
P1:
PU1:
PM1:
RD:
WR××: Write signal
WR
WR
WR
RD
(CSIM10) and serial clock selection register 10 (CSIC10) to the default status (00H).
PORT
PM
PU
Port register 1
Pull-up resistor option register 1
Port mode register 1
Read signal
Output latch
Alternate
Alternate
function
function
PM10
PU10
(P10)
PM1
PU1
P1
Figure 4-4. Block Diagram of P10
Preliminary User’s Manual U19014EJ1V0UD
CHAPTER 4 PORT FUNCTIONS
EV
DD
P-ch
P10/SCK10