参数资料
型号: mPD789322
厂商: NEC Corp.
元件分类: 8位微控制器
英文描述: 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
中文描述: 8位微控制器与2/4/8K字节在系统可编程闪存
文件页数: 17/96页
文件大小: 482K
代理商: MPD789322
Preliminary Product Information U14673EJ1V0PM00
24
PD789322,789324,789326,789327
Table 5-3. Port Mode Registers and Output Latch Settings When Using Alternate Functions
Alternate Function
Pin Name
Name
I/O
PM
××
P
××
Input
1
×
P20
SCK10
Output
0
1
P21
SO10
Output
0
1
P22
SI10
Input
1
×
P40 to P43
KR00 to KR03
Input
1
×
P60
TO40
Output
0
P61
INT
Input
1
×
P80 to P85
S22 to S17
Note
Output
××
Note When using P80 to P85 pins as S22 to S17, set port function register 8 (PF8) to 3FH.
Remark
×:
don’t care
PM
××: Port mode register
P
××:
Port output latch
(2) Pull-up resistor option register 0 (PU0)
This register sets whether to use on-chip pull-up resistors for ports 0, 1, and 4 on a port by port basis. An on-
chip pull-up resistor can be used only for those bits set to the input mode of a port for which the use of the on-
chip pull-up resistor has been specified using PU0.
For those bits set to the output mode, on-chip pull-up resistors cannot be used, regardless of the setting of
PU0. This also applies to alternate-function pins used as output pins.
PU0 is set using a 1-bit or 8-bit memory manipulation instruction.
RESET input sets this register to 00H.
Figure 5-4. Format of Pull-Up Resistor Option Register 0
Symbol
7
6
5
<4>
3
2
<1>
<0>
Address
After reset
R/W
PU0
0
PU04
0
PU01
PU00
FFF7H
00H
R/W
PU0m
Port m on-chip pull-up resistor selection
(m = 0, 1, 4)
0
An on-chip pull-up resistor is not connected
1
An on-chip pull-up resistor is connected
Caution Always set bits 2, 3, and 5 to 7 to 0.
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