參數(shù)資料
型號(hào)： HCD404084
廠商： Hitachi,Ltd.
英文描述： Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計(jì)算機(jī))
中文描述： 低電壓如同在微機(jī)芯片的A / D轉(zhuǎn)換器（帶片上的A / D轉(zhuǎn)換器的低壓微計(jì)算機(jī)）
文件頁數(shù)： 55/162頁
文件大?。?/td> 482K
代理商： HCD404084
HD404374/HD404384/HD404389/HD404082/HD404084 Series
55
Internal Oscillator Circuit
Figure 20 shows the clock pulse generator circuit. As shown in table 21, a ceramic oscillator or crystal
oscillator can be connected to OSC1 and OSC2, and a 32.768 kHz crystal oscillator can be connected to X1
and X2. External clock operation is possible for the system oscillator. CR oscillation for system oscillator
is possible. CR oscillation function is optional. Set bit 1 (SSR1) of the system clock select register (SSR:
$004) according to the frequency of the oscillator connected to OSC1 and OSC2 (figure 22).
Note:
If the setting of bit 1 in the system clock select register does not match the frequency of the system
oscillator, the subsystem using 32.768 kHz oscillation will not operate correctly in the HD404374
Series.
Also, the CR oscillation frequency differs depending on the operating voltage and resistance value. Set bit
1 of the system clock select register to match the operating frequency. Note that if the frequency being used
does not match the setting of bit 1 of the system clock select register, subsystems using the 32.768 kHz
oscillation frequency will not operate correctly.
OSC
1
X1
LSON
System
clock
selection
circuit
OSC
2
System
oscillator
1/4 or 1/32
division
circuit*
Timing
generation
circuit
f
OSC
f
cyc
t
cyc
X2
Sub
system
clock
oscillator
1/8 or 1/4
division
circuit*
Timing
generator
circuit
f
x
f
SUB
t
subcyc
1/8
division
circuit
Timing
generation
circuit
f
W
t
wcyc
CPU
PER
CPU
ROM
RAM
Registers, flags
I/O
Peripheral
functions
Interrupts
TMA3 bit
Timer A
interrupts
Time
base
clock
selection
circuit
CLK
Notes: The division ratio can be selected by setting bit 0 or bit 2 in the system clock select register
(SSR:$004).
HD404374 series
Figure 20 Clock Pulse Generator Circuit
相關(guān)PDF資料
PDF描述
HCD40C4084 Low-Voltage AS Microcomputers with On-Chip A/D Converter(帶片上A/D轉(zhuǎn)換器的低壓微計(jì)算機(jī))
HCD40C4344R 4-bit HMCS400-series microcomputer(4位單片微計(jì)算機(jī))
HCD44780UBxx 320 x 240 pixel format, CFL backlight available with power harness
HCD44780UA00 320 x 240 pixel format, CFL backlight available with power harness
HCD44780UA02 320 x 240 pixel format, CFL backlight available with power harness
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HCD404344R 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-bit microcomputers
HCD404669 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit
HCD404889 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Low-Voltage AS Microcomputers with On-Chip LCD Circuit
HCD40C4344R 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:4-bit microcomputers
HCD44780UA00 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot Matrix Liquid Crystal Display Controller/Driver
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