參數(shù)資料
型號(hào)： UPD78045H
廠商： NEC Corp.
元件分類： DC/DC變換器
英文描述： 1 watt dc-dc converters
中文描述： 1瓦的DC - DC轉(zhuǎn)換器
文件頁(yè)數(shù)： 17/58頁(yè)
文件大?。?/td> 552K
代理商： UPD78045H
17
μ
PD78044H, 78045H, 78046H
5.2 CLOCK GENERATOR CIRCUIT
The clock generator circuit has two kinds of generator circuits: the main system clock and subsystem clock.
The instruction time can be changed.
0.4
μ
s/0.8
μ
s/1.6
μ
s/3.2
μ
s/6.4
μ
s (with main system clock: 5.0 MHz)
122
μ
s (with subsystem clock: 32.768 kHz)
Fig. 5-1 Clock Generator Circuit Block Diagram
5.3 TIMER/EVENT COUNTER
Five channels of timer/event counters are provided.
16-bit timer/event counter
8-bit timer/event counter
Watch timer
Watchdog timer
: 1 channel
: 2 channels
: 1 channel
: 1 channel
Table 5-2 Timer/Event Counter Groups and Configurations
F
G
16-bit timer/
event counter
8-bit timer/
event counter
Watch
timer
Watchdog
timer
Interval timer
1 channel
2 channels
1 channel
1 channel
External event counter
1 channel
—
—
—
Timer output
1 output
2 outputs
—
—
PWM output
1 output
—
—
—
Pulse width measurement
1 input
—
—
—
Square wave output
1 output
2 outputs
—
—
Interrupt request
1
2
1
1
Test input
—
—
1 input
—
Subsystem
clock generator
circuit
Main system
clock generator
circuit
Pre-scaler
S
Pre-scaler
To INTP0
sampling clock
Standby
control
circuit
CPU clock (
f
CPU
)
Clock to
hardware peripherals
Clock output circuit
f
XT
f
X
XT1/P04
XT2
X1
X2
f
X
2
f
X
2
2
f
X
2
3
f
X
2
4
STOP
f
XT
2
2
1
S
Noise
eliminator
S
Watch timer
f
X
8
f
X
16
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