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): 136/144頁
文件大?。?/td> 1378K
代理商: M789436
CHAPTER 4 PORT FUNCTIONS
User’s Manual U15075EJ1V0UM00
91
4.2.5 Port 5
This is a 4-bit N-ch open-drain I/O port with an output latch. Port 5 can be specified in the input or output mode in
1-bit units by using port mode register 5 (PM5). For a mask ROM version, use of an on-chip pull-up resistor can be
specified by a mask option.
This port is set in the input mode when the RESET signal is input.
Figure 4-13 shows a block diagram of port 5.
Figure 4-13. Block Diagram of P50 to P53
Internal
bus
Selector
RD
PM50 to PM53
P50 to P53
N-ch
WRPORT
Output latch
(P50 to P53)
WRPM
VDD
Mask option resistor
Mask ROM version only.
For flash memory version,
a pull-up resistor is not
incorporated.
PM:
Port mode register
RD:
Port 5 read signal
WR:
Port 5 write signal
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