參數(shù)資料
型號： HCD404669
廠商： Hitachi,Ltd.
英文描述： Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計算機)
中文描述： 低電壓如同在微機芯片的DTMF產(chǎn)生電路（帶雙音多頻電路的低電壓微計算機）
文件頁數(shù)： 34/142頁
文件大?。?/td> 894K
代理商： HCD404669
HD404669 Series
34
Active Mode:
All MCU functions operate according to the clock generated by the system oscillator OSC
1
and OSC
2
.
Standby Mode:
In standby mode, the oscillators continue to operate, but the clocks related to instruction
execution stop. Therefore, the CPU operation stops, but all RAM and register contents are retained, and the
D or R port status, when set to output, is maintained. Peripheral functions such as interrupts, timers, and
serial interface continue to operate. The power dissipation in this mode is lower than in active mode
because the CPU stops. (Interrupts, timers, the serial interface, and other peripheral functions continue to
operate. The exception is the comparator, which is halted.)
The MCU enters standby mode when the SBY instruction is executed in active mode.
Standby mode is terminated by a RESET input or an interrupt request. If it is terminated by RESET input,
the MCU is reset as well. After an interrupt request, the MCU enters active mode and executes the next
instruction after the SBY instruction. If the interrupt enable flag is 1, the interrupt is then processed; if it is
0, the interrupt request is left pending and normal instruction execution continues. Figure 15 shows a
flowchart of MCU operation.
Stop mode
System clock
oscillator started
MCU reset
System clock
oscillator started
STOPC
=0
RAME=1
RAME=0
Interrupts
enabled
IF0 ·
IM0
=1
IF1 ·
IM1
=1
IFTA ·
IMTA
=1
IF2·
IM2
= 1
IFTC·
IMTC
+
IF3·
IM3
=1
IFTD·
IMTD
+
IF4·
IM4
=1
IF =1,
IM=0,
IE =1
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
Yes
*
*
*
*
No
Yes
*
Only when clearing from standby mode.
Note:
*
Standby mode
Watch mode
RESET=1
Next instruction
execution
Next instruction
execution
IFS1·
IMS1
=1
RESET=1
Figure 15 MCU Operation Flowchart
相關PDF資料
PDF描述
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HCD404889 Low-Voltage AS Microcomputers with On-Chip LCD Circuit(片上LCD電路的低壓微計算機)
HCD404899 Low-Voltage AS Microcomputers with On-Chip LCD Circuit(片上LCD電路的低壓微計算機)
HCD40C4082 Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計算機)
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