參數(shù)資料
型號(hào): HD404369
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)
文件頁數(shù): 71/115頁
文件大小: 452K
代理商: HD404369
HD404369 Series
71
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%.
Port Mode Register C (PMRC: $025):
Four-bit write-only register that selects the alarm frequencies as
shown in figure 57. It is reset to $0 by MCU reset.
Port Mode Register A (PMRA: $004):
Four-bit write-only register that selects D
3
/BUZZ pin function as
shown in figure 51. It is reset to $0 by MCU reset.
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 56 Alarm Output Function Block Diagram
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