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HD404618TF Datasheet(PDF) 54 Page - Renesas Technology Corp

Part # HD404618TF
Description  4-Bit Single-Chip Microcomputer
PDF  91 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD404618TF Datasheet(HTML) 54 Page - Renesas Technology Corp

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HD404618 Series
52
A write signal input to the serial mode register discontinues the input of the transmit clock to the serial data
register and octal counter. Therefore, if a write is performed during data transmission, the octal counter is
reset to 000 to stop transmission, and at the same time, the serial interrupt request flag is set.
Write operations are valid from the second instruction execution cycle, so the STS instruction must be
executed after at least two cycles have been executed. The serial mode register is initialized to $0 by MCU
reset.
Table 25 Serial Mode Register
SMR
Bit 3
R0
0/ SCK Pin
0R0
0 port input/output pin
1
SCK input/output pin
SMR
Transmit Clock
Bit 2
Bit 1
Bit 0
R0
0/ SCK Pin
Clock Source
Prescaler
Division Ratio
System Clock
Division Ratio
00
0
SCK output
Prescaler
÷ 2048
÷ 4096
00
1
SCK output
Prescaler
÷ 512
÷ 1024
01
0
SCK output
Prescaler
÷ 128
÷ 256
01
1
SCK output
Prescaler
÷ 32
÷ 64
10
0
SCK output
Prescaler
÷ 8
÷ 16
10
1
SCK output
Prescaler
÷ 2
÷ 4
11
0
SCK output
System clock
—
÷ 1
11
1
SCK input
External clock
—
—
PMRA3 PMRA2 PMRA1
PMRA: $004
SMR3
SMR2
SMR1
SMR0
SMR: $005
R0 /SO pin mode selection
Transmit clock selection
R0 /
SCK pin mode selection
0
R0 /SI pin mode selection
2
1
PMRA0
Figure 31 Configurations and Functions of the Mode Registers



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