參數資料
型號: μPD789197
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8 位單片微控制器)
中文描述: 8位單片機微控制器(8位單片微控制器)
文件頁數: 30/146頁
文件大?。?/td> 630K
代理商: ΜPD789197
Preliminary Product Information
30
μ
PD789186, 789187, 789196, 789197
Figure 6-3. Port Mode Register Format
1
1
PM05
PM04
PM03
PM02
PM01
PM00
PM0
Symbol
Address
When reset
R/W
FF20H
FFH
R/W
FFH
R/W
FFH
R/W
FFH
R/W
FFH
R/W
6
7
0
5
4
3
2
1
1
1
1
1
1
1
PM11
PM10
PM1
FF21H
1
PM26
PM25
PM24
PM23
PM22
PM21
PM20
PM2
FF22H
1
1
1
1
PM33
PM32
PM31
PM30
PM3
FF23H
1
1
1
1
PM53
PM52
PM51
PM50
PM5
FF25H
PMmn
Pmn pin input/output mode selection
(m = 0 to 3 or 5; n = 0 to 7)
Output mode (output buffer ON)
Input mode (output buffer OFF)
0
1
(2) Pull-up resistor option registers (PU0, PUB2, PUB3)
These registers are used to specify pull-up resistor connection on a port-by-port basis and bit-by-bit basis.
The method of pull-up resistor connection varies, depending on whether a connection is made on a port-by-
port basis or bit-by-bit basis as described below.
(a) Pull-up resistor option register (PU0)
This register is used for port-by-port specification. 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 is 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 a dual-function pin used as an output pin.
A RESET input clears PU0 to 00H.
(b) Pull-up resistor option registers (PUB2, PUB3)
These registers are used for bit-by-bit specification. By specifying PUB2 or PUB3, an on-chip pull-up
resistor can be used, regardless of the setting of the port mode register.
A RESET input clears PUB2 and PUB3 to 00H.
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