upd78f9211grt2-jjg-a ETC-unknow, upd78f9211grt2-jjg-a Datasheet - Page 59

• Manufacturer Part Number: upd78f9211grt2-jjg-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: ETC-unknow

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
PM47
7
1
7
1
7
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)
PM46
6
1
6
1
6
Figure 4-8. Format of Port Mode Register
PM45
5
1
5
1
5
Selection of I/O mode of Pmn pin (m = 2 to 4; n = 0 to 7)
CHAPTER 4 PORT FUNCTIONS
User’s Manual U16994EJ3V0UD
PM44
4
1
4
1
4
PM23
PM43
3
3
1
3
PM22
PM32
PM42
2
2
2
PM21
PM41
1
1
1
1
PM20
PM40
0
0
1
0
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