參數(shù)資料
型號(hào): HD40L4818
廠商: Hitachi,Ltd.
英文描述: 4-Bit Single-Chip Microcomputer(4位單片微計(jì)算機(jī))
中文描述: 4位單片機(jī)(4位單片微計(jì)算機(jī))
文件頁(yè)數(shù): 26/98頁(yè)
文件大?。?/td> 621K
代理商: HD40L4818
HD404818 Series
26
Operating Modes
The MCU has five operating modes that are specified by how the clock is used. The functions available in
each mode are listed in table 15, and operations are shown in table 16. Transitions between operating
modes are shown in figure 9.
Table 16 provides additional information for table 26.
Table 15 Functions Available in Each Operating Mode
Mode Name
Active
Standby
Stop
Watch
Subactive
*
4
INT
or timer A
interrupt
request from
watch mode
Activation method
RESET
cancellation,
interrupt
request
SBY
instruction
TMA3 = 0,
STOP
instruction
TMA3 = 1,
STOP
instruction
Status
System oscillator
OP
OP
Stopped
Stopped
Stopped
Subsystem oscillator OP
OP
OP
*
1
OP
OP
Instruction execution
(
CPU
)
Peripheral function,
interrupt (
PER
)
Clock function,
interrupt (
CLK
)
RAM
OP
Stopped
Stopped
Stopped
OP
OP
OP
Stopped
Stopped
OP
OP
OP
Stopped
OP
*
2
OP
*
2
OP
Retained
Retained
Retained
OP
Registers/flags
OP
Retained
Reset
Retained
OP
I/O
OP
Retained
High
impedance
*
3
Retained
*
3
OP
*
3
Cancellation method
RESET input,
STOP/SBY
instruction
RESET input,
interrupt
request
RESET input
RESET input,
INT
or timer A
interrupt
request
RESET input,
STOP/SBY
instruction
Notes: OP indicates operating.
1. To reduce current dissipation, stop all oscillation in external circuits.
2. Refer to the Interrupt Frame section for details.
3. Refer to interrupt frame.
4. Subactive mode is an optional function to be specified on the function option list.
5. In the watch and subactive modes, the MCU requires a 32.768-kHz crystal oscillator.
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