UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 52

• 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

4.2.1
port mode register 2 (PM2). When the P20 to P23 pins are used as an input port, an on-chip pull-up resistor can be
connected in 1-bit units by using pull-up resistor option register 2 (PU2).
52
Port 2 is a 4-bit I/O port with an output latch. Each bit of this port can be set to the input or output mode by using
This port is also used as the analog input pins of the internal A/D converter.
Reset signal generation sets port 2 to the input mode.
Figure 4-2 shows the block diagram of port 2.
Port 2
P2:
PU2:
PM2:
PMC2: Port mode control register 2
RD:
WR××: Write signal
WR
WR
WR
WR
RD
PORT
PMC
PM
PU
Port register 2
Pull-up resistor option register 2
Port mode register 2
Read signal
PMC20 to PMC23
PM20 to PM23
PU20 to PU23
(P20 to P23)
Output latch
A/D converter
PMC2
PM2
PU2
P2
Figure 4-2. Block Diagram of P20 to P23
CHAPTER 4 PORT FUNCTIONS
User’s Manual U16898EJ5V0UD
V
DD
P-ch
P20/ANI0 to P23/ANI3