參數(shù)資料
型號(hào): HD404358S
廠商: Hitachi,Ltd.
英文描述: 4-bit HMCS400-Series microcomputer
中文描述: 4位HMCS400系列微機(jī)
文件頁(yè)數(shù): 59/100頁(yè)
文件大?。?/td> 398K
代理商: HD404358S
HD404358 Series
59
Alarm Output Function
The MCU has a built-in pulse output function called BUZZ. The pulse frequency can be selected from the
prescaler S’s outputs, and the output frequency depends on the state of port mode register C (PMRC: $025).
The duty cycle of the pulse output is fixed at 50%.
I
÷
÷
÷
÷
2
5
1
2
Selector
System
clock
PER
Prescaler S (PSS)
2
Alarm output
control signal
BUZZ
Alarm output
controller
Port mode
register C
(PMRC)
Port mode
register A
(PMRA)
Figure 49 Alarm Output Function Block Diagram
Port Mode Register C (PMRC: $025):
Four-bit write-only register that selects the alarm frequencies as
shown in figure 50. It is reset to $0 by MCU reset.
Bit
Initial value
Read/Write
Bit name
3
0
W
PMRC3
2
0
W
PMRC2
0
0
W
PMRC0
1
Undefined
W
PMRC1
Port mode register C (PMRC: $025)
PMRC1
0
1
Output Level Control in Idle States
Low level
High level
PMRC0
0
1
Serial Clock Division Ratio
Prescaler output divided by 2
Prescaler output divided by 4
PMRC3
0
1
0
1
PMRC2
System Clock Divisor
÷
2048
÷
1024
÷
512
÷
256
0
1
Figure 50 Port Mode Register C (PMRC)
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