UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 62

• Manufacturer Part Number: UPD78F9222MC(T)-5A4-A
• Description: 8BIT MCU, 4K FLASH, 256B RAM, 78F9222
• Manufacturer: NEC

Specifications of UPD78F9222MC(T)-5A4-A

• Controller Family/series: UPD78
• No. Of I/o's: 17
• Ram Memory Size: 256Byte
• Cpu Speed: 10MHz
• No. Of Timers: 4
• No. Of: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

4.2.5
4.3
62
This is a 1-bit output-only port.
Figure 4-12 shows the block diagram of port 13.
The ports are controlled by the following four types of registers.
• Port mode registers (PM2, PM3, PM4, PM12)
• Port registers (P2, P3, P4, P12, P13)
• Port mode control register 2 (PMC2)
• Pull-up resistor option registers (PU2, PU3, PU4, PU12)
(1) Port mode registers (PM2, PM3, PM4, PM12)
Registers Controlling Port Functions
These registers are used to set the corresponding port to the input or output mode in 1-bit units.
Each port mode register can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets these registers to FFH.
When a port pin is used as an alternate-function pin, set its port mode register and output latch as shown in
Table 4-3.
Caution Because P30, P31, and P43 are also used as external interrupt pins, the corresponding
Port 13
P13:
RD:
WR××: Write signal
Remark When a reset is input, P130 outputs a low level. If P130 outputs a high level immediately after
WR
Port register 13
Read signal
interrupt request flag is set if each of these pins is set to the output mode and its output level
is changed.
interrupt mask flag to 1 in advance.
RD
PORT
reset is released, the output signal of P130 can be used as a dummy CPU reset signal.
To use the port pin in the output mode, therefore, set the corresponding
Output latch
(P130)
P13
Figure 4-12. Block Diagram of P130
CHAPTER 4 PORT FUNCTIONS
User’s Manual U16898EJ5V0UD
P130