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HD404324FS Datasheet(PDF) 74 Page - Renesas Technology Corp

Part # HD404324FS
Description  microcomputer designed to increase program productivity
PDF  103 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD404324FS Datasheet(HTML) 74 Page - Renesas Technology Corp

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HD404054 Series/HD404094 Series
72
Bit
Initial value
Read/Write
Bit name
3
0
W
SM1A3
2
0
W
SM1A2
0
0
W
SM1A0
1
0
W
SM1A1
Serial mode register 1A (SM1A: $005)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
SM1A2
SM1A0
SM1A1
SM1A3
0
1
R41/SCK1
mode selection
R41
SCK1
SCK1
Output
Output
Input
Clock source
Prescaler
System clock
External clock
—
—
Prescaler
division ratio
Refer to
table 26
Figure 53 Serial Mode Register 1A (SM1A)
Serial Mode Register 1B (SM1B: $028): This register has the following functions (figure 54).
• Serial interface 1 prescaler division ratio selection
• Serial interface 1 output level control in idle states
Serial mode register 1B (SM1B: $028) is a 2-bit write-only register. It cannot be written during data
transfer.
By setting bit 0 (SM1B0) of this register, the serial interface 1 prescaler division ratio is selected. Only bit
0 (SM1B0) can be reset to 0 by MCU reset. By setting bit 1 (SM1B1), the output level of the SO
1 pin is
controlled in idle states of serial interface 1. The output level changes at the same time that SM1B1 is
written to.



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