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): 140/144頁
文件大?。?/td> 1378K
代理商: M789436
CHAPTER 4 PORT FUNCTIONS
User’s Manual U15075EJ1V0UM00
95
4.2.9 Port 9 (
PD789426, 789436 Subseries only)
This is an 8-bit I/O port with an output latch. Port 9 can be specified in the input or output mode in 1-bit units by
using port mode register 9 (PM9). When using the pins of this port as input port pins, on-chip pull-up resistors can be
connected in 1-bit units by using pull-up resistor option register B9 (PUB9).
This port is set in the input mode when the RESET signal is input.
Figure 4-17 shows a block diagram of port 9.
Figure 4-17. Block Diagram of P90 to P97
WRPUB9
RD
WRPORT
WRPM
PUB90 to PUB97
Output latch
(P90 to P97)
PM90 to PM97
VDD
P-ch
P90 to P97
Internal
bus
Selector
PUB9: Pull-up resistor option register B9
PM:
Port mode register
RD:
Port 9 read signal
WR:
Port 9 write signal
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