- 您现在的位置：买卖IC网 > PDF目录80460 > M37544M2-XXXSP 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 PDF资料下载
参数资料
| 型号： | M37544M2-XXXSP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| 封装： | 0.400 INCH, 1.78 MM PITCH, PLASTIC, SDIP-32 |
| 文件页数： | 63/70页 |
| 文件大小： | 645K |
| 代理商： | M37544M2-XXXSP |
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页当前第63页第64页第65页第66页第67页第68页第69页第70页
7544 Group
Rev.1.04
2004.06.08
page 64 of 66
REJ03B0012-0104Z
4. I/O pin function when serial I/O is enabled.
The pin functions of P12/SCLK and P13/SRDY are switched to as
follows according to the setting values of a serial I/O mode selec-
tion bit (bit 6 of serial I/O control register (address 1A16)) and a
serial I/O synchronous clock selection bit (bit 1 of serial I/O control
register).
(1) Serial I/O mode selection bit
→ “1” :
Clock synchronous type serial I/O is selected.
Setup of a serial I/O synchronous clock selection bit
“0” : P12 pin turns into an output pin of a synchronous clock.
“1” : P12 pin turns into an input pin of a synchronous clock.
Setup of a SRDY output enable bit (SRDY)
“0” : P13 pin can be used as a normal I/O pin.
“1” : P13 pin turns into a SRDY output pin.
(2) Serial I/O mode selection bit
→ “0” :
Clock asynchronous (UART) type serial I/O is selected.
Setup of a serial I/O synchronous clock selection bit
“0”: P12 pin can be used as a normal I/O pin.
“1”: P12 pin turns into an input pin of an external clock.
When clock asynchronous (UART) type serial I/O is selected, it
functions P13 pin. It can be used as a normal I/O pin.
Notes on A/D conversion
1. Analog input pin
In order to execute the A/D conversion correctly, to complete the
charge to an internal capacitor within the specified time is re-
quired. The maximum output impedance of the analog input
source required to complete the charge to a capacitor within the
specified time is as follows;
About 35 k
(at f(XIN) = 8 MHz)
When the maximum output impedance exceeds the above value,
equip an analog input pin with an external capacitor of 0.01
F to
1
F between an analog input pin and VSS.
Further, be sure to verify the operation of application products on
the user side.
<Reason>
An analog input pin includes the capacitor for analog voltage com-
parison. Accordingly, when signals from signal source with high
impedance are input to an analog input pin, charge and discharge
noise generates. This may cause the A/D conversion/comparison
precision to be worse.
2. Clock frequency during A/D conversion
The comparator consists of a capacity coupling, and a charge of
the capacity will be lost if the clock frequency is too low. This may
cause the A/D conversion precision to be worse. Accordingly, set
f(XIN) in order that the A/D conversion clock is 500 kHz or over
during A/D conversion.
3. A/D conversion accuracy
As for AD translation accuracy, on the following operating condi-
tions, accuracy may become low.
(1) Since the analog circuit inside a microcomputer becomes sen-
sitive to noise when VREF voltage is set up lower than Vcc
voltage, accuracy may become low rather than the case
where VREF voltage and Vcc voltage are set up to the same
value.
(2) When VREF voltage is lower than [ 3.0 V ], the accuracy at the
low temperature may become extremely low compared with
that at room temperature. When the system would be used at
low temperature, the use at VREF=3.0 V or more is recom-
mended.
Notes on Watchdog Timer
1. The watchdog timer is operating during the wait mode. Write
data to the watchdog timer control register to prevent timer un-
derflow.
2. The watchdog timer stops during the stop mode. However, the
watchdog timer is running during the oscillation stabilizing time
after the STP instruction is released. In order to avoid the un-
derflow of the watchdog timer, the watchdog timer control
register must be written just before executing the STP instruc-
tion.
3. The STP instruction disable bit (bit 6 of watchdog timer control
register (address 3916)) can be set to “1” but cannot be set to
“0” by program.
Notes on RESET pin
1. Connecting capacitor
In case where the RESET signal rise time is long, connect a ce-
ramic capacitor or others across the RESET pin and the Vss pin.
And use a 1000 pF or more capacitor for high frequency use.
When connecting the capacitor, note the following :
Make the length of the wiring which is connected to a capacitor
as short as possible.
Be sure to verify the operation of application products on the
user side.
<Reason>
If the several nanosecond or several ten nanosecond impulse
noise enters the RESET pin, it may cause a microcomputer fail-
ure.
相关PDF资料 |
PDF描述 |
|---|---|
| MB90567PMC | 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP64 |
| M37221MAH-XXXSP | 8-BIT, MROM, 8.1 MHz, MICROCONTROLLER, PDIP42 |
| M38037M8-XXXHP | 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PQFP64 |
| M38049FFFP | 8-BIT, FLASH, 8.4 MHz, MICROCONTROLLER, PQFP64 |
| M38049FFHSP | 8-BIT, FLASH, 8.4 MHz, MICROCONTROLLER, PDIP64 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M37544RSS | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37545G1KP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37545G2KP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37545G4GP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37545G4GP#U0 | 功能描述:MCU 2/5V 16K 32-LQFP QZ-ROM 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:80C 核心处理器:8051 芯体尺寸:8-位 速度:16MHz 连通性:EBI/EMI，I²C，UART/USART 外围设备:POR，PWM，WDT 输入/输出数:40 程序存储器容量:- 程序存储器类型:ROMless EEPROM 大小:- RAM 容量:256 x 8 电压 - 电源 (Vcc/Vdd):4.5 V ~ 5.5 V 数据转换器:A/D 8x10b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:68-LCC（J 形引线） 包装:带卷 (TR) |
发布紧急采购，3分钟左右您将得到回复。