UPD78F9222MC(T)-5A4-A NEC, UPD78F9222MC(T)-5A4-A Datasheet - Page 53

• 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

4.2.2
output mode by using port mode register 3 (PM3). When the P30 to P31 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 3 (PU3). This port is also used
for both timer I/O and external interrupt request input pin functions.
reset function. For the setting method for pin functions, see CHAPTER 17 OPTION BYTE.
Pins P30 and P31 constitute a 2-bit I/O port with an output latch. Each bit of this port can be set to the input or
Reset signal generation sets port 3 to the input mode.
P34 is a 1-bit input-only port. This pin is also used as a RESET pin, and when the power is turned on, this is the
When P34 is used as an input port pin, connect the pull-up resistor.
Figures 4-3 to 4-5 show the block diagrams of port 3.
Port 3
P3:
PU3:
PM3:
RD:
WR××: Write signal
WR
WR
WR
RD
PORT
PU
PM
Port register 3
Pull-up resistor option register 3
Port mode register 3
Read signal
Output latch
Alternate
function
PM30
PU30
(P30)
PU3
PM3
P3
Figure 4-3. Block Diagram of P30
CHAPTER 4 PORT FUNCTIONS
User’s Manual U16898EJ5V0UD
V
DD
P-ch
P30/TI000/INTP0
53