參數(shù)資料
型號: M34551E8-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, MICROCONTROLLER, PQFP48
封裝: 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48
文件頁數(shù): 134/154頁
文件大?。?/td> 1778K
代理商: M34551E8-XXXFP
4551 Group User’s Manual
APPLICATION
2-3
2.1 I/O pins
(3)
Port P2
Port P2 is a 4-bit input port.
s Input of port P2
Port P2 is also used as SEG16–SEG19. Accordingly, when ports P20/SEG16–P23/SEG19 are used
as port P2, set the corresponding bits of the LCD control register L2 to “1.”
q Data input to port P2
The state of port P2 is transferred to register A when the IAP2 instruction is executed.
(4)
Port D
D0–D7 are eight independent output ports.
s Output of port D
Each pin of port D has an independent 1-bit wide output function. For output of ports D0–D7, select
one of port D with the register Y of the data pointer first.
q Data output from port D
Set the output level to the output latch with the SD and RD instructions.
The state of pin enters the high-impedance state when the SD instruction is executed.
The states of all port D enter the high-impedance state when the CLD instruction is executed.
The state of pin becomes “L” level when the RD instruction is executed.
The output structure is an N-channel open-drain.
Notes 1: When the SD and RD instructions are used, do not set “10002” or more to register Y.
2: Port D6 is also used as XCIN, and port D7 is also used as XCOUT. Accordingly, when using
port D6 and D7 functions, set the clock control register MR2 to “0.”
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