參數(shù)資料
型號: HD40L4812
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計算機)
中文描述: 4位單片機(4位單片微計算機)
文件頁數(shù): 28/98頁
文件大?。?/td> 621K
代理商: HD40L4812
HD404818 Series
28
Reset
f :
f :
:
:
:
Operating
Operating
Stopped
f
f
cyc
cyc
f :
f :
:
:
:
Operating
Operating
Stopped
f
f
cyc
SUB
f :
f :
:
:
:
Operating
Operating
f
f
f
cyc
cyc
cyc
f :
f :
:
:
:
Operating
Operating
f
f
f
cyc
cyc
SUB
f :
f :
:
:
:
Stopped
Operating
f
f
f
SUB
SUB
SUB
f :
f :
:
:
:
Stopped
Operating
Stopped
Stopped
Stopped
f :
f :
:
:
:
Stopped
Operating
Stopped
f
Stopped
SUB
f :
f :
:
:
:
Stopped
Operating
Stopped
f
Stopped
SUB
Standby mode
Stop mode
(TMA3 = 0)
Watch mode
Subactive mode
(TMA3 = 1)
(TMA3 = 1, LSON = 0)
(TMA3 = 1, LSON = 1)
(TMA3 = 0)
SBY (standby)
Interrupt
Timers A, B, C
Serial,
INT
,
INT
SBY (standby)
Interrupt
STOP
STOP
INT
,
Timer A
1
INT
,
Timer A
1
STOP
STOP/SBY
(LSON = 1)
4
2
3
1. Time-base interrupt
2. STOP/SBY (DTON = 1, LSON = 0)
3. STOP/SBY (DTON = 0, LSON = 0)
4. DTON is not affected
f :
f :
f :
f :
:
:
:
LSON:
DTON:
Main oscillation frequency
Suboscillation frequency
for time-base
f /4
f /8
System clock
Clock for time-base
Clock for other
peripheral functions
Low speed on flag
Direct transfer on flag
Active mode
Timers A, B, C
Serial,
INT
0 1
Notes:
*
*
*
*
*
Figure 9 MCU Status Transitions
Active Mode:
The MCU operates according to the clock generated by the system oscillators OSC
1
and
OSC
2
.
Standby Mode:
The MCU enters standby mode when the SBY instruction is executed from active mode.
In this mode, the oscillators, interrupts, timer/counters, and serial interface continue to operate, but all
instruction execution-related clocks stop. The stopping of these clocks stops the CPU, retaining all RAM
and register contents and maintaining the current I/O pin status.
Standby mode is terminated by a RESET input oran interrupt request. If it is terminated by a RESET input,
the MCU is reset as well. After an interrupt request, the MCU enters active mode and resumes, executing
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