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參數(shù)資料
| 型號： | HD404639R |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-Bit Single-Chip Microcomputer(4位單片微計算機(jī)) |
| 中文描述： | 4位單片機(jī)（4位單片微計算機(jī)） |
| 文件頁數(shù)： | 28/133頁 |
| 文件大小： | 803K |
| 代理商： | HD404639R |
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HD404639R Series
28
Active Mode:
All MCU functions operate according to the clock generated by the system oscillators 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.
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. A flowchart of
operation in standby mode is shown in figure 15.
Stop Mode:
In stop mode, all MCU operations stop and RAM data is retained. Therefore, the power
dissipation in this mode is the least of all modes. The OSC
1
and OSC
2
oscillator stops. For the X1 and X2
oscillator to operate or stop can be selected by setting bit 3 of system clock select register 1 (SSR1: $029;
operating: SSR13 = 0, stop: SSR13 = 1) (figure 24). The MCU enters stop mode if the STOP instruction is
executed in active mode when bit 3 of timer mode register A (TMA: $008) is set to 0 (TMA3 = 0) (figure
41).
Stop mode is terminated by a RESET input or a
STOPC
input as shown in figure 16. RESET or
STOPC
must be applied for at least one t
RC
to stabilize oscillation (refer to the AC Characteristics section). When
the MCU restarts after stop mode is cancelled, all RAM contents before entering stop mode are retained,
but the accuracy of the contents of the accumulator, B register, W register, X/SPX register, Y/SPY register,
carry flag, and serial data register cannot be guaranteed.
Watch Mode:
In watch mode, the clock function (timer A) using the X1 and X2 oscillator operates but
other function operations stop. Therefore, the power dissipation in this mode is the second least to stop
mode, and this mode is convenient when only clock display is used. In this mode, the OSC
1
and OSC
2
oscillator stops, but the X1 and X2 oscillator operates. The MCU enters watch mode if the STOP
instruction is executed in active mode when TMA3 = 1, or if the STOP or SBY instruction is executed in
subactive mode.
Watch mode is terminated by a RESET input or a timer-A/
INT
0
interrupt request. For details of RESET
input, refer to the Stop Mode section. When terminated by a timer-A/
INT
0
interrupt request, the MCU
enters active mode if LSON is 0, or subactive mode if LSON is 1. After an interrupt request is generated,
the time required to enter active mode is t
RC
for a timer A interrupt, and T
X
(where T + t
RC
< T
X
< 2T + t
RC
)
for an
INT
0
interrupt, as shown in figures 17 and 18.
Operation during mode transition is the same as that at standby mode cancellation (figure 15).
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| HD404652H | RES T 0.2E 5W 1% |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD404639RF | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-Bit Single-Chip Microcomputer |
| HD404639RSERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| HD404652 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer |
| HD404652H | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer |
| HD404652S | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer |
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