參數(shù)資料
型號: μPD78F9197Y
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(jī)微控制器(8位單片微控制器)
文件頁數(shù): 29/150頁
文件大?。?/td> 636K
代理商: ΜPD78F9197Y
Preliminary Product Information
29
μ
PD78F9197Y
Remark
PMmn: Bit n of port mode register m, where m = 0 to 3 and n = 0 to 7
Pmn
: Bit n of port m
RD
: Port read signal
WR
: Port write signal
For details, see
(2)
in
Section 7.1.3
.
7.1.3
Port function control registers
The following two types of registers are used to control the ports.
Port mode registers (PM0 to PM3, and PM5)
Pull-up resistor option registers (PU0, PUB2, and PUB3)
(1) Port mode registers (PM0 to PM3, and PM5)
The port mode registers separately specify each port bit as being for input or output.
Each port mode register is manipulated using a 1-bit or 8-bit memory manipulation instruction.
A RESET input writes FFH into the port mode registers.
When port pins are used for secondary functions, the corresponding port mode register and output latch must
be set or reset as described in Table 7-3.
Caution
When port 3 is acting as an output port, and its output level is changed, an interrupt
request flag is set, because this port is also used as the input for an external interrupt.
To use port 3 in output mode, therefore, the interrupt mask flag must be set to 1 in
advance.
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