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| 型号： | M37545G4-XXXGP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP32 |
| 封装： | 7 X 7 MM, 0.80 MM PITCH, PLASTIC, LQFP-32 |
| 文件页数： | 22/65页 |
| 文件大小： | 782K |
| 代理商： | M37545G4-XXXGP |
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Rev.1.07
Mar 19, 2009
Page 27 of 60
REJ03B0140-0107
7545 Group
3. Timer 3
Timer 3 is an 8-bit timer and counts the clock selected by the
timer 3 count source selection bit. When Timer 3 underflows, the
timer 3 interrupt request bit is set to “1”.
Timer 3 has a timer latch to retain the reload value.
The value written to timer 3 (T3) while timer 3 is stopped is
transferred to the timer latch and the counter.
After the count of timer 3 (T3) starts, the value written to timer 3
is transferred only to the timer 3 latch. The value is not
transferred to the counter at write.
When timer underflows, the value of timer 3 latch is transferred
to the counter. (Since a count value of a timer is retained, the
written value becomes the count value of the timer after the next
underflow.)
When timer 3 (T3) is read, the count value of the timer is read.
When the timer 3 is read, the count value of timer 3 is read since
the count value of the timer 3 is retained until writing to timer 3
(T3) is performed after timer 3 is stopped.
Timer 3 always operates in the timer mode.
Timer 3 counts the clock selected by the timer 3 count source
selection bit. The contents of Timer 3 is decremented by 1 each
time the count clock is input.
The division ratio of Timer 3 is 1/(n+1) provided that the value
of Timer 3 is n.
Timer 3 is stopped by setting “1” to the timer 3 count stop bit.
Timer 2 and timer 3 are also used for the control timer of the
carrier wave control circuit.
Fig. 22 Structure of timer count source set register
Fig. 23 Timer 1, 2, 3 control register
b7
b0
Timer count source set register
(TCSS : address 002A16, initial value: 0016)
Timer 2 count source selection bits
b1 b0
0
0 : f(XIN)/16
0
1 : f(XIN)/2
1
0 : f(XIN)/8
1
1 : f(XIN)/1
Disable (return “0” when read)
Timer 3 count source selection bits
b3 b2
0
0 : f(XIN)/16
0
1 : f(XIN)/2
1
0 : f(XIN)/8
1
1 : Carrier wave output (CARRY)
b7
Timer 1, 2, 3 control register
(TC123 : address 002B16, initial value: 0616)
Timer 1 count stop bit
0: Count start
1: Count stop
Timer 2 count stop bit
0: Count start
1: Count stop
Timer 3 count stop bit
0: Count start
1: Count stop
Disable (return “0” when read)
b0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M37545G6GP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37545G6GP#U0 | 功能描述:MCU 3/5V 24K 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) |
| M37545G6KP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37545G6-XXXGP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37545G8GP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
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