參數(shù)資料
型號: HD407A4369
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer(4位單片微計算機)
中文描述: 4位HMCS400系列微機(4位單片微計算機)
文件頁數(shù): 76/115頁
文件大小: 710K
代理商: HD407A4369
HD404369 Series
76
When bits 0 and 1 (PMRA0, PMRA1) of port mode register A (PMRA: $004) are 00 in transmit clock
wait state and if the transmit clock is input (17), the serial interface enters continuous clock output state.
If the serial mode register (SMR: $005) is written to in continuous clock output mode (18), STS wait
state is entered.
Output Level Control in Idle States:
In idle states, that is, STS wait state and transmit clock wait state,
the output level of the SO pin can be controlled by setting bit 1 (PMRC1) of port mode register C (PMRC:
$025) to 0 or 1. The output level control example is shown in figure 60. Note that the output level cannot be
controlled in transfer state.
Transmit Clock Error Detection (In External Clock Mode):
The serial interface will malfunction if a
spurious pulse caused by external noise conflicts with a normal transmit clock during transfer. A transmit
clock error of this type can be detected as shown in figure 61.
Table 27
Serial Interface Operating Modes
SMR
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 28
Serial Transmit Clock (Prescaler Output)
PMRC
SMR
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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