UPD78F0988AGC-8BS Renesas Electronics America, UPD78F0988AGC-8BS Datasheet - Page 89

• Manufacturer Part Number: UPD78F0988AGC-8BS
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0988AGC-8BS

• Lead Free Status / Rohs Status: Supplier Unconfirmed

4.2 Configuration of Ports
4.2.1 Port 0
register 0 (PM0). When using port 0, internal pull-up resistors can be connected in 1-bit units by using pull-up resistor
option register 0 (PU0).
trigger signal for the A/D converter.
A port consists of the following hardware.
This is a 4-bit I/O port with output latches. Port 0 can be set in the input or output mode in 1-bit units via port mode
Alternate functions include external interrupt request input, external input to stop timer output, and an external
RESET input sets port 0 to input mode.
Figure 4-2 shows the block diagram of port 0.
Caution Because port 0 is also used as an external interrupt request input, an interrupt request flag is
Control registers
Ports
Pull-up resistors
set when the port is set in the output mode and its output level is changed. When using port
0 in the output mode, therefore, set the interrupt mask flag to 1.
Item
Total
Input
I/O
Table 4-2. Port Configuration
CHAPTER 4 PORT FUNCTIONS
User’s Manual U13029EJ7V1UD
Port mode register (PM0, PM2 to PM6)
Pull-up resistor option register (PU0, PU2 to PU6)
47
8
39
39 (software control)
Configuration
87