參數(shù)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(shù): 127/144頁
文件大?。?/td> 1378K
代理商: M789436
CHAPTER 4 PORT FUNCTIONS
User’s Manual U15075EJ1V0UM00
83
4.2.3 Port 2
This is a 7-bit I/O port with an output latch. Port 2 can be specified in the input or output mode in 1-bit units by
using port mode register 2 (PM2). When using the P20 to P26 pins as input port pins, on-chip pull-up resistors can
be connected in 1-bit units by using pull-up resistor option register B2 (PUB2).
The port is also used as the serial interface I/O, buzzer output, and timer output.
This port is set in the input mode when the RESET signal is input.
Figures 4-5 to 4-10 show block diagrams of port 2.
Caution
When using the pins of port 2 as the serial interface, the I/O or output latch must be set
according to the function to be used. For how to set the latches, see Figure 12-2 Settings of
Serial Interface 20 Operating Mode.
Figure 4-5. Block Diagram of P20
WRPUB2
RD
WRPORT
WRPM
PUB20
Output latch
(P20)
PM20
VDD
P-ch
P20
Selector
Internal
bus
PUB2:
Pull-up resistor option register B2
PM:
Port mode register
RD:
Port 2 read signal
WR:
Port 2 write signal
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