參數(shù)資料
型號: μPD789177Y
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(shù): 27/145頁
文件大小: 610K
代理商: ΜPD789177Y
Preliminary Product Information
26
μ
PD789166Y, 789167Y, 789176Y, 789177Y
5.1.2
Port configuration
The hardware configuration of the ports is as follows.
Table 5-2. Port Configuration
Item
Configuration
Control register
Port mode register (PMm, where m = 0, 1, 2, 3, or 5)
Pull-up resistor option registers (PU0, PUB2, and PUB3)
Port pins
Total: 31 (17 CMOS input/output, 8 CMOS input-only, and 6 N-ch open-drain input/output pins)
Pull-up resistors
Total: 21 (on-chip pull-up resistors can be used as specified by software, and whether a port itself is
to contain pull-up resistors can be specified with a mask option)
Figure 5-2. Basic CMOS Port Configuration
I
S
WR
PUm
Note
WR
PORTm
WR
PORTm
WR
PMm
Output latch
(Pmn)
PMmn
V
DD
P-ch
Pmn
Note
Each bit of the pull-up resistor option registers (PU0, PUB2, and PUB3)
PU00 and PU01 for PU0
PUB20 to PUB22, PUB25, and PUB26 for PUB2
PUB30 to PUB33 for PUB3
For details, see
(2)
in
Section 5.1.3
.
Caution
Figure 5-2 shows the basic configuration of the CMOS input/output ports. The configuration
differs depending on the functions assigned to the dual-function pins.
P23, P24, and port 5 are not included in the basic configuration because they are used as
N-channel open-drain input/output ports.
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