UPD78F9502MA-CAC-A NEC, UPD78F9502MA-CAC-A Datasheet - Page 58

• Manufacturer Part Number: UPD78F9502MA-CAC-A
• Description: 8BIT MCU, 4K FLASH, 128B RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F9502MA-CAC-A

• Controller Family/series: UPD78F
• No. Of I/o's: 8
• Ram Memory Size: 128Byte
• Cpu Speed: 10MHz
• No. Of Timers: 2
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

58
Address: FF32H, After reset: 00H R/W
Address: FF33H, After reset: 00H R/W
Address: FF34H, After reset: 00H R/W
Symbol
Symbol
Symbol
PU2
PU3
PU4
(3) Pull-up resistor option registers (PU2 to PU4)
These registers are used to specify whether an on-chip pull-up resistor is connected to P20 to P23, P32, P34,
P40 and P43.
corresponding to the bit of PU2 to PU4.
PU2 to PU4 are set by using a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation set these registers to 00H.
PUmn
7
0
7
0
7
0
0
1
Does not connect on-chip pull-up resistor
Connects on-chip pull-up resistor
By setting PU2 to PU4, an on-chip pull-up resistor can be connected to the port pin
6
0
6
0
6
0
Figure 4-11. Format of Pull-up Resistor Option Register
Selection of connection of on-chip pull-up resistor of Pmn (m = 2 to 4; n = 0 to 4)
5
0
5
0
5
0
Preliminary User’s Manual U18681EJ1V0UD
CHAPTER 4 PORT FUNCTIONS
PU34
4
0
4
4
0
PU23
PU43
3
3
0
3
PU22
PU32
2
2
2
0
PU21
1
1
0
1
0
PU20
PU40
0
0
0
0