參數(shù)資料
型號(hào)： HD404448
廠商： Hitachi,Ltd.
英文描述： 4-bit HMCS400-Series microcomputer(4位單片微計(jì)算機(jī))
中文描述： 4位HMCS400系列微機(jī)（4位單片微計(jì)算機(jī)）
文件頁數(shù)： 39/123頁
文件大?。?/td> 726K
代理商： HD404448
HD404449 Series
39
Internal Oscillator Circuit
A block diagram of the clock generation circuit is shown in figure 25. As shown in table 22, a ceramic
oscillator or crystal oscillator can be connected to OSC
1
and OSC
2
, and a 32.768-kHz oscillator can be
connected to X1 and X2. The system oscillator can also be operated by an external clock. Bit 1 (SSR1) of
the system clock select register (SSR: $029) must be selected according to the frequency of the oscillator
connected to OSC
1
and OSC
2
(figure 26).
Note:
If the system clock select register (SSR: $029) setting does not match the oscillator frequency,
subsystems using the 32.768-kHz oscillation will malfunction.
OSC
2
OSC
1
X1
X2
System
oscillator
Sub-
system
oscillator
1/4
division
circuit
Timing
generator
circuit
System
clock
selection
CPU with ROM,
RAM, registers,
flags, and I/O
Peripheral
function
interrupt
Time-base
interrupt
Time-base
clock
selection
1/8 or 1/4
division
circuit
Note
Timing
generator
circuit
Timing
generator
circuit
1/8
division
circuit
f
W
t
Wcyc
f
SUB
t
subcyc
LSON
TMA3
f
cyc
t
cyc
f
OSC
f
X
CPU
PER
CLK
Note: 1/8 or 1/4 division ratio can be selected by setting bit 2 of the system
clock select register (SSR: $029).
Figure 25 Clock Generation Circuit
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD404448H 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:HD404449 SERIES
HD404448TF 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:HD404449 SERIES
HD404449 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:HD404449 SERIES
HD404449H 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:HD404449 SERIES
HD404449SERIES 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
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