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): 138/144頁
文件大?。?/td> 1378K
代理商: M789436
CHAPTER 4 PORT FUNCTIONS
User’s Manual U15075EJ1V0UM00
93
4.2.7 Port 7
This is a 3-bit I/O port with an output latch. Port 7 can be specified in the input or output mode in 1-bit units by
using port mode register 7 (PM7). When using the P70 to P72 pins as input port pins, on-chip pull-up resistors can be
connected in 1-bit units by using pull-up resistor option register B7 (PUB7).
This port is set in the input mode when the RESET signal is input.
Figure 4-15 shows a block diagram of Port 7.
Figure 4-15. Block Diagram of P70 to P72
WRPUB7
RD
WRPORT
WRPM
PUB70 to PUB72
Output latch
(P70 to P72)
PM70 to PM72
VDD
P-ch
P70 to P72
Internal
bus
Selector
PUB7: Pull-up resistor option register B7
PM:
Port mode register
RD:
Port 7 read signal
WR:
Port 7 write signal
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