UPD78F9502MA-CAC-A NEC, UPD78F9502MA-CAC-A Datasheet - Page 56

• 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

56
Address: FF22H, After reset: FFH, R/W
Symbol
PM2
Address: FF23H, After reset: FFH, R/W
Symbol
PM3
Address: FF24H, After reset: FFH, R/W
Symbol
PM4
(1) Port mode registers (PM2 to PM4)
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 P21 and P32 are also used as external interrupt pins, the corresponding interrupt
PMmn
7
1
7
1
7
1
0
1
request flag is set if each of these pins is set to the output mode and its output level is
changed. To use the port pin in the output mode, therefore, set the corresponding interrupt
mask flag to 1 in advance.
Output mode (output buffer ON)
Input mode (output buffer OFF)
6
1
6
1
6
1
Figure 4-8. Format of Port Mode Register
5
1
5
1
5
1
Preliminary User’s Manual U18681EJ1V0UD
Selection of I/O mode of Pmn pin (m = 2 to 4; n = 0 to 3)
CHAPTER 4 PORT FUNCTIONS
4
1
4
1
4
1
PM23
PM43
3
3
1
3
PM22
PM32
2
2
2
1
PM21
1
1
1
1
1
PM20
PM40
0
0
1
0