upd78f0103hmca1-5a4-a Renesas Electronics Corporation., upd78f0103hmca1-5a4-a Datasheet - Page 77

• Manufacturer Part Number: upd78f0103hmca1-5a4-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

4.2.6 Port 13
4.3 Registers Controlling Port Function
(1) Port mode registers (PM0, PM1, PM3, and PM12)
Port 13 is a 1-bit output-only port.
Figure 4-13 shows a block diagram of port 13.
Remark When reset is effected, P130 outputs a low level. If P130 is set to output a high level before reset is
Port functions are controlled by the following three types of registers.
• Port mode registers (PM0, PM1, PM3, PM12)
• Port registers (P0 to P3, P12, P13)
• Pull-up resistor option registers (PU0, PU1, PU3, PU12)
These registers specify input or output mode for the port in 1-bit units.
These registers can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input sets these registers to FFH.
When port pins are used as alternate-function pins, set the port mode register and output latch as shown in Table
4-4.
RD:
WR××: Write signal
effected, the output signal of P130 can be dummy-output as the reset signal to the CPU.
WR
Read signal
RD
PORT
Output latch
(P130)
Figure 4-13. Block Diagram of P130
CHAPTER 4 PORT FUNCTIONS
User’s Manual U16846EJ3V0UD
P130
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