參數(shù)資料
型號(hào)： HD404654
廠(chǎng)商： Hitachi,Ltd.
英文描述： RESISTOR, 0.10 OHM 5W
中文描述： 4位單片機(jī)
文件頁(yè)數(shù)： 31/109頁(yè)
文件大?。?/td> 430K
代理商： HD404654
HD404654 Series
31
Internal Oscillator Circuit
A block diagram of the clock generation circuit is shown in figure 17. As shown in table 18, a ceramic
oscillator or crystal oscillator can be connected to OSC
1
and OSC
2
. The system oscillator can also be
operated by an external clock. Bit 1 (SSR11) of system clock select register 1 (SSR1: $029) and bit 2
(SSR22) of system clock select register 2 (SSR2: $02A) must be selected according to the frequency of the
oscillator connected to OSC
1
and OSC
2
(figure 18).
Note:
If the SSR10, SSR11 and SSR22 setting does not match the oscillator frequency, the DTMF
generator will malfunction.
After
RESET
input or after stop mode has been cancelled, the division ratio of the system clock can be
selected as 1/4 or 1/32 by setting the SEL pin level.
1/4 division ratio: Connect SEL to V
CC
.
1/32 division ratio: Connect SEL to GND.
OSC
2
OSC
1
System
oscillator
1/4 or
1/32
division
circuit
*
Timing
generator
circuit
CPU with ROM,
RAM, registers,
flags, and I/O
Peripheral
function
interrupt
f
cyc
t
cyc
f
OSC
φ
CPU
φ
PER
Note:
*
1/4 or 1/32 division ratio can be selected by pin SEL.
Figure 17 Clock Generation Circuit
相關(guān)PDF資料
PDF描述
HD404654H 4-Bit Single-Chip Microcomputer
HD404654S 4-Bit Single-Chip Microcomputer
HD4074654 4-Bit Single-Chip Microcomputer
HD4074654H 4-Bit Single-Chip Microcomputer
HD4074654S 4-Bit Single-Chip Microcomputer
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD404654H 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer
HD404654S 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:4-Bit Single-Chip Microcomputer
HD404654SERIES 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:
HD4046612 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit
HD4046612H 制造商:HITACHI 制造商全稱(chēng):Hitachi Semiconductor 功能描述:Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit
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