- 您现在的位置：买卖IC网 > PDF目录296384 > M38224MAXXXFS (Mitsubishi Electric Corporation) SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER PDF资料下载
参数资料
| 型号： | M38224MAXXXFS |
| 厂商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 单芯片8位CMOS微机 |
| 文件页数： | 38/78页 |
| 文件大小： | 998K |
| 代理商： | M38224MAXXXFS |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页当前第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页
43
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
3822 Group
MITSUBISHI MICROCOMPUTERS
CLOCK GENERATING CIRCUIT
The 3822 group has two built-in oscillation circuits. An oscillation
circuit can be formed by connecting a resonator between XIN and
XOUT (XCIN and XCOUT). Use the circuit constants in accordance
with the resonator manufacturer's recommended values. No exter-
nal resistor is needed between XIN and XOUT since a feed-back
resistor exists on-chip. However, an external feed-back resistor is
needed between XCIN and XCOUT.
To supply a clock signal externally, input it to the XIN pin and make
the XOUT pin open. The sub-clock XCIN-XCOUT oscillation circuit
cannot directly input clocks that are externally generated. Accord-
ingly, be sure to cause an external resonator to oscillate.
Immediately after poweron, only the XIN oscillation circuit starts
oscillating, and XCIN and XCOUT pins function as I/O ports.
Frequency Control
(1) Middle-speed Mode
The internal clock
φ is the frequency of XIN divided by 8.
After reset, this mode is selected.
(2) High-speed Mode
The internal clock
φ is half the frequency of XIN.
(3) Low-speed Mode
qThe internal clock
φ is half the frequency of XCIN.
qA low-power consumption operation can be realized by stopping
the main clock XIN in this mode. To stop the main clock, set bit 5
of the CPU mode register to “1”.
When the main clock XIN is restarted, set enough time for oscil-
lation to stabilize by programming.
Note: If you switch the mode between middle/high-speed and low-
speed, stabilize both XIN and X CIN oscillations. The
sufficient time is required for the sub-clock to stabilize, es-
pecially immediately after poweron and at returning from
stop mode. When switching the mode between middle/high-
speed and low-speed, set the frequency on condition that
f(XIN) > 3f(XCIN).
Fig. 42 Ceramic resonator circuit
Fig. 43 External clock input circuit
Oscillation Control
(1) Stop Mode
If the STP instruction is executed, the internal clock
φ stops at an
“H” level, and XIN and XCIN oscillators stop. Timer 1 is set to
“FF16” and timer 2 is set to “0116”.
Either XIN or XCIN divided by 16 is input to timer 1 as count
source, and the output of timer 1 is connected to timer 2. The bits
of the timer 123 mode register except bit 4 are cleared to “0”. Set
the timer 1 and timer 2 interrupt enable bits to disabled (“0”) be-
fore executing the STP instruction. Oscillator restarts at reset or
when an external interrupt is received, but the internal clock
φ is
not supplied to the CPU until timer 2 underflows. This allows timer
for the clock circuit oscillation to stabilize.
(2) Wait Mode
If the WIT instruction is executed, the internal clock
φ stops at an
“H” level. The states of XIN and XCIN are the same as the state be-
fore the executing the WIT instruction. The internal clock restarts
at reset or when an interrupt is received. Since the oscillator does
not stop, normal operation can be started immediately after the
clock is restarted.
XCIN XCOUT
XIN
XOUT
CIN
COUT
CCIN
CCOUT
Rf
Rd
XIN
External oscillation circuit
Open
VCC
VSS
CCIN
CCOUT
Rf
Rd
XCIN
XCOUT
XOUT
相关PDF资料 |
PDF描述 |
|---|---|
| M38224MAXXXGP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38225MCMFP | 50000 SYSTEM GATE 2.5 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN |
| M38225E1FP | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38225E1FS | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M38225MCMFS | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M38227ECFP | 功能描述:IC 740 MCU EPROM 48K 80QFP RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 产品培训模块:CAN Basics Part-1 CAN Basics Part-2 Electromagnetic Noise Reduction Techniques Part 1 M16C Product Overview Part 1 M16C Product Overview Part 2 标准包装:1 系列:M16C™ M32C/80/87 核心处理器:M32C/80 芯体尺寸:16/32-位 速度:32MHz 连通性:EBI/EMI，I²C，IEBus，IrDA，SIO，UART/USART 外围设备:DMA，POR，PWM，WDT 输入/输出数:121 程序存储器容量:384KB（384K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:24K x 8 电压 - 电源 (Vcc/Vdd):3 V ~ 5.5 V 数据转换器:A/D 34x10b，D/A 2x8b 振荡器型:内部 工作温度:-20°C ~ 85°C 封装/外壳:144-LQFP 包装:托盘 产品目录页面:749 (CN2011-ZH PDF) 配用:R0K330879S001BE-ND - KIT DEV RSK M32C/87 |
| M38227ECFP#U0 | 功能描述:MCU 3/5V 48K PB-FREE 80-QFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:740/38000 标准包装:250 系列:56F8xxx 核心处理器:56800E 芯体尺寸:16-位 速度:60MHz 连通性:CAN，SCI，SPI 外围设备:POR，PWM，温度传感器，WDT 输入/输出数:21 程序存储器容量:40KB（20K x 16） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:6K x 16 电压 - 电源 (Vcc/Vdd):2.25 V ~ 3.6 V 数据转换器:A/D 6x12b 振荡器型:内部 工作温度:-40°C ~ 125°C 封装/外壳:48-LQFP 包装:托盘 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| M38227ECFS | 制造商:Renesas Electronics Corporation 功能描述:MCU 8BIT 740 CISC 48KB EPROM 5V 80CLCC - Bulk |
| M38227FGFP | 制造商:Renesas Electronics Corporation 功能描述:SLIM740 OTP 16K/512B RAM, W/A-D, LED, 4 - Rail/Tube |
| M38227RFS | 制造商:Renesas Electronics Corporation 功能描述:MCU - Trays |
发布紧急采购，3分钟左右您将得到回复。