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參數(shù)資料
| 型號(hào)： | HD404369F |
| 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)： | 31/115頁 |
| 文件大?。?/td> | 452K |
| 代理商： | HD404369F |
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HD404369 Series
31
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 = 0, or subactive mode if LSON = 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 14 and 15.
Operation during mode transition is the same as that at standby mode cancellation (figure 12).
Stop mode
Oscillator
Internal
clock
STOP instruction execution
t
res
≥
t
RC
(stabilization period)
t
res
RESET
or
STOPC
Figure 13 Timing of Stop Mode Cancellation
Subactive Mode:
The OSC
1
and OSC
2
oscillator stops and the MCU operates with a clock generated by
the X1 and X2 oscillator. In this mode, functions except the A/D conversion operate. However, because the
operating clock is slow, the power dissipation becomes low, next to watch mode.
The CPU instruction execution speed can be selected as 244
μ
s or 122
μ
s by setting bit 2 (SSR12) of the
system clock select register 1 (SSR1: $027). Note that the SSR12 value must be changed in active mode. If
the value is changed in subactive mode, the MCU may malfunction.
When the STOP or SBY instruction is executed in subactive mode, the MCU enters either watch or active
mode, depending on the statuses of the low speed on flag (LSON: $020, bit 0) and the direct transfer on
flag (DTON: $020, bit 3).
Interrupt Frame:
In watch and subactive modes,
CLK
is applied to timer A and the
INT
0
circuit. Prescaler
W and timer A operate as the time-base and generate the timing clock for the interrupt frame. Three
interrupt frame lengths (T) can be selected by setting the miscellaneous register (MIS: $00C) (figure 15).
In watch and subactive modes, the timer-A/
INT
0
interrupt is generated synchronously with the interrupt
frame. The interrupt request is generated synchronously with the interrupt strobe timing except during
transition to active mode. The falling edge of the
INT
0
signal is input asynchronously with the interrupt
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相關(guān)代理商/技術(shù)參數(shù) |
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| HD404372 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:HMCS43XXFamily User＇s Manual/Device |
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