參數(shù)資料
型號: HD4074459
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer(4位單片微計(jì)算機(jī))
中文描述: 4位HMCS400系列微機(jī)(4位單片微計(jì)算機(jī))
文件頁數(shù): 83/120頁
文件大?。?/td> 692K
代理商: HD4074459
HD404459 Series
83
The output level of the SO pins is undefined until the first data of each serial interface 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 the STS instruction and is incremented at the rising edge of the transmit clock for the serial interface.
When the eighth transmit clock signal is input or when serial transmission/reception is discontinued, the
octal counter is reset to 000, the serial interrupt request flag (IFS: $023, bit 0) for serial interface is set, and
the transfer stops.
When the prescaler output is selected as the transmit clock of the serial interface, 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) (table 29).
Table 28
Serial Interface Operating Mode
SMRA
PMRA
Bit 3
Bit 1
Bit 0
Operating Mode
1
0
0
Continuous clock output mode
1
Transmit mode
1
0
Receive mode
1
Transmit/receive mode
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
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