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參數(shù)資料

HD404654 Series

Registers for Serial Interface 1

When serial interface 1 operation is selected, serial data is read and written by the following registers.

Serial mode register 1A (SM1A: $005)

Serial mode register 1B (SM1B: $028)

Serial data register 1 (SR1L: $006, SR1U: $007)

Port mode register A (PMRA: $004)

Miscellaneous register (MIS: $00C)

Serial Mode Register 1A (SM1A: $005):

This register has the following functions (figure 56).

SCK

pin function selection

Serial interface 1 transmit clock selection

Serial interface 1 prescaler division ratio selection

Serial interface 1 initialization

Serial mode register 1A is a 4-bit write-only register. It is reset to $0 by MCU reset.

A write signal input to serial mode register 1A (SM1A: $005) discontinues the input of the transmit clock

to serial data register 1 (SR1L: $006, SR1U: $007) and the octal counter, and the octal counter is reset to

000. Therefore, if a write is performed during data transfer, the serial 1 interrupt request flag (IFS1: $003,

bit 2) is set.

Written data is valid from the second instruction execution cycle after the write operation, so the STS

instruction must be executed at least two cycles after that.

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HD404652S	4-Bit Single-Chip Microcomputer
HD404654	RESISTOR, 0.10 OHM 5W
HD404654H	4-Bit Single-Chip Microcomputer
HD404654S	4-Bit Single-Chip Microcomputer
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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
HD404652S	制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer
HD404654	制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer
HD404654H	制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer
HD404654S	制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer
HD404654SERIES	制造商:未知廠家制造商全稱:未知廠家功能描述:

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