參數(shù)資料
型號(hào)： HD4074618
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(yè)數(shù)： 51/89頁(yè)
文件大?。?/td> 358K
代理商： HD4074618
HD404618 Series
51
Serial Interface
The MCU has a clock-synchronous serial interface which transmits and receives 8-bit data.
The serial interface consists of a serial data register (SR), serial mode register (SMR), port mode register A
(PMRA), octal counter, and multiplexers (see figure 30). The R0
0
/
SCK
pin and the transmit clock are
controlled by writing to the SMR. The transmit clock shifts the contents of the SR, which can be read and
written to by software.
The serial interface is activated by the STS instruction. The octal counter is reset to 000 by this instruction,
starts counting at the falling edge of the transmit clock (
SCK
), and it increments at the rising edge of the
clock. A serial interrupt request flag is set when the eighth transmit clock signal is input (the serial
interface is reset) or when serial transmission is discontinued (the octal counter is reset).
I
Port mode
register A
(PMRA)
SCK
Selector
System
clock
f
cyc
/f
sub
(t
cyc
/t
subcyc
)
Prescaler S (PSS)
I/O
control
logic
3
Serial mode
register
(SMR)
Clock
Serial data
register (SR)
Serial interrupt
request flag
(IFS)
S
1/2
SI
SO
Octal
counter (OC)
I/O
control
logic
Transfer
control
signal
2
÷
8
÷
3
÷
1
÷
5
÷
2
÷
Figure 30 Serial Interface Block Diagram
Serial Mode Register (SMR: $005):
Four-bit write-only register that controls the R0
0
/
SCK
pin, prescaler
division ratio, and transmit clock source (table 25 and figure 31). Writing to this register initializes the
serial interface.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD4074618F 制造商:Renesas Electronics Corporation 功能描述:
HD4074618FS 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer
HD4074618H 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer
HD4074618TF 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer
HD4074629 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:AS Microcomputer Incorporating a DTMF Generator Circuit
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