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參數(shù)資料
| 型號： | HD4048412 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-Bit Single-Chip Microcomputer |
| 中文描述： | 4位單片機(jī) |
| 文件頁數(shù)： | 81/125頁 |
| 文件大?。?/td> | 471K |
| 代理商： | HD4048412 |
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HD404849 Series
81
Pin Setting:
The R2
1
/
SCK
pin is controlled by writing data to serial mode register A (SMRA: $005). The
R2
2
/SI and R2
3
/SO pins are controlled by writing data to port mode register A (PMRA: $004). Refer to the
following Registers for Serial Interface section for details.
Transmit Clock Source Setting:
The transmit clock source is set by writing data to serial mode register A
(SMRA: $005) and serial mode register B (SMRB: $028). Refer to the following Registers for Serial
Interface section for details.
Data Setting:
Serial data is set by writing data to the serial data register (SRL: $006, SRU, $007).
Receive data is obtained by reading the contents of the serial data register. The serial data is shifted by the
transmit clock and is input from or output to an external system.
The output level of the SO pin remains unsettled until the first data is output after MCU reset, or until the
output level control in idle states is performed.
Transfer Control:
The serial interface is activated by the STS instruction. The octal counter is reset to
000 by this instruction, and it increments at the rising edge of the transmit clock. When the eighth transmit
clock signal is input or when serial transmission/receive is discontinued, the octal counter is reset to 000,
the serial interrupt request flag (IFS: $023, bit 2) is set, and the transfer stops.
When the prescaler output is selected as the transmit clock, the transmit clock frequency is selected as 4t
cyc
to 8192t
cyc
by setting bits 0 to 2 (SMRA0– SMRA2) of serial mode register A (SMRA: $005) and bit 0
(SMRB0) of serial mode register B (SMRB: $028) as listed in table 29.
Table 29 Serial Transmit Clock (Prescaler Output)
SMRB
SMRA
Bit 0
Bit 2
Bit 1
Bit 0
Prescaler Division Ratio
Transmit Clock Frequency
0
0
0
0
÷
2048
÷
512
÷
128
÷
32
÷
8
÷
2
÷
4096
÷
1024
÷
256
÷
64
÷
16
÷
4
4096t
cyc
1024t
cyc
256t
cyc
64t
cyc
16t
cyc
4t
cyc
8192t
cyc
2048t
cyc
512t
cyc
128t
cyc
32t
cyc
8t
cyc
1
1
0
1
1
0
0
1
1
0
0
0
1
1
0
1
1
0
0
1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD4048412FS | 4-Bit Single-Chip Microcomputer |
| HD4048412H | RELAY BASE |
| HD4048412TF | 4-Bit Single-Chip Microcomputer |
| HD404848 | 4-Bit Single-Chip Microcomputer |
| HD404848FS | 4-Bit Single-Chip Microcomputer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD4048412FS | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer |
| HD4048412H | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer |
| HD4048412TF | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-Bit Single-Chip Microcomputer |
| HD404848 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer |
| HD404848FS | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer |
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