參數資料
型號: m789436
廠商: NEC Corp.
元件分類: 8位微控制器
英文描述: 8-Bit Single-Chip Microcontrollers
中文描述: 8位單芯片微控制器
文件頁數: 143/144頁
文件大?。?/td> 1378K
代理商: M789436
CHAPTER 4 PORT FUNCTIONS
98
User’s Manual U15075EJ1V0UM00
Table 4-3. Port Mode Register and Output Latch Settings When Using Alternate Functions
Alternate Function
Pin Name
Name
I/O
PMxx
Pxx
P00 to P03
KR0 to KR3
Input
1
x
P26
TO90
Output
0
INTP0
Input
1
x
P30
CPT90
Input
1
x
INTP1
Input
1
x
TO50
Output
0
P31
TMI60
Input
1
x
INTP2
Input
1
x
P32
TO60
Output
0
INTP3
Input
1
x
P33
TO61
Output
0
P60 to P65
ANI0 to ANI5
Input
1
x
Caution
When port 2 is used as a serial interface pin, the I/O latch or output latch must be set according
to its function. For the setting method, see Table 12-2 Settings of Serial Interface 20 Operating
Mode.
Remark
x:
don’t care
PMxx:
Port mode register
Pxx:
Port output latch
(2)
Pull-up resistor option register 0 (PU0)
Pull-up resistor option register 0 (PU0) sets whether on-chip pull-up registers are used on ports 0 and 1 or
not.
On the port specified to use an on-chip pull-up resistor by PU0, the pull-up resistor can be internally used
only for the bits set in the input mode. No on-chip pull-up resistors can be used for the bits set in the output
mode regardless of the setting of PU0. This also applies to cases when the pins are used for alternate
functions.
PU0 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets PU0 to 00H.
Figure 4-19. Format of Pull-Up Resistor Option Register 0
Pm on-chip pull-up resistor selection
(m = 0, 1)
000000
PU01 PU00
PU0
Address
After reset
R/W
FFF7H
00H
R/W
765432
<1>
<0>
PU0m
0
1
On-chip pull-up resistor not used
On-chip pull-up resistor used
Symbol
Caution
Bits 2 to 7 must be set to 0.
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