- 您现在的位置：买卖IC网 > PDF目录80512 > M37540E8GP 8-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDSO36 PDF资料下载
参数资料
| 型号： | M37540E8GP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDSO36 |
| 封装： | 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-36 |
| 文件页数： | 18/90页 |
| 文件大小： | 830K |
| 代理商： | M37540E8GP |
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页当前第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页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页
7540 Group
Rev.4.00
Jun 21, 2004
page 23 of 82
REJ03B0011-0400Z
Timers
The 7540 Group has 5 timers: timer 1, timer A, timer X, timer Y
and timer Z.
The division ratio of every timer and prescaler is 1/(n+1) provided
that the value of the timer latch or prescaler is n.
All the timers are down count timers. When a timer reaches “0”, an
underflow occurs at the next count pulse, and the corresponding
timer latch is reloaded into the timer. When a timer underflows, the
interrupt request bit corresponding to each timer is set to “1”.
qTimer 1
Timer 1 is an 8-bit timer and counts the prescaler output.
When Timer 1 underflows, the timer 1 interrupt request bit is set to
“1”.
Prescaler 1 is an 8-bit prescaler and counts the signal which is the
oscillation frequency divided by 16.
Prescaler 1 and Timer 1 have the prescaler 1 latch and the timer 1
latch to retain the reload value, respectively. The value of
prescaler 1 latch is set to Prescaler 1 when Prescaler 1
underflows.The value of timer 1 latch is set to Timer 1 when Timer
1 underflows.
When writing to Prescaler 1 (PRE1) is executed, the value is writ-
ten to both the prescaler 1 latch and Prescaler 1.
When writing to Timer 1 (T1) is executed, the value is written to
both the timer 1 latch and Timer 1.
When reading from Prescaler 1 (PRE1) and Timer 1 (T1) is ex-
ecuted, each count value is read out.
Timer 1 always operates in the timer mode.
Prescaler 1 counts the signal which is the oscillation frequency di-
vided by 16. Each time the count clock is input, the contents of
Prescaler 1 is decremented by 1. When the contents of Prescaler
1 reach “0016”, an underflow occurs at the next count clock, and
the prescaler 1 latch is reloaded into Prescaler 1 and count contin-
ues. The division ratio of Prescaler 1 is 1/(n+1) provided that the
value of Prescaler 1 is n.
The contents of Timer 1 is decremented by 1 each time the under-
flow signal of Prescaler 1 is input. When the contents of Timer 1
reach “0016”, an underflow occurs at the next count clock, and the
timer 1 latch is reloaded into Timer 1 and count continues. The di-
vision ratio of Timer 1 is 1/(m+1) provided that the value of Timer
1 is m. Accordingly, the division ratio of Prescaler 1 and Timer 1 is
1/((n+1)(m+1)) provided that the value of Prescaler 1 is n and
the value of Timer 1 is m.
Timer 1 cannot stop counting by software.
qTimer A
Timer A is a 16-bit timer and counts the signal which is the oscil-
lation frequency divided by 16. When Timer A underflows, the
timer A interrupt request bit is set to “1”.
Timer A consists of the low-order of Timer A (TAL) and the high-or-
der of Timer A (TAH).
Timer A has the timer A latch to retain the reload value. The value
of timer A latch is set to Timer A at the timing shown below.
When Timer A undeflows.
When an active edge is input from CNTR1 pin (valid only when
period measurement mode and pulse width HL continuously mea-
surement mode).
When writing to both the low-order of Timer A (TAL) and the high-
order of Timer A (TAH) is executed, the value is written to both the
timer A latch and Timer A.
When reading from the low-order of Timer A (TAL) and the high-or-
der of Timer A (TAH) is executed, the following values are read out
according to the operating mode.
In timer mode, event counter mode:
The count value of Timer A is read out.
In period measurement mode, pulse width HL continuously mea-
surement mode:
The measured value is read out.
Be sure to write to/read out the low-order of Timer A (TAL) and the
high-order of Timer A (TAH) in the following order;
Read
Read the high-order of Timer A (TAH) first, and the low-order of
Timer A (TAL) next and be sure to read out both TAH and TAL.
Write
Write to the low-order of Timer A (TAL) first, and the high-order of
Timer A (TAH) next and be sure to write to both TAL and TAH.
Timer A can be selected in one of 4 operating modes by setting
the timer A mode register.
(1) Timer mode
Timer A counts the oscillation frequency divided by 16. Each time
the count clock is input, the contents of Timer A is decremented by
1. When the contents of Timer A reach “000016”, an underflow oc-
curs at the next count clock, and the timer A latch is reloaded into
Timer A. The division ratio of Timer A is 1/(n+1) provided that the
value of Timer A is n.
(2) Period measurement mode
In the period measurement mode, the pulse period input from the
P00/CNTR1 pin is measured.
CNTR1 interrupt request is generated at rising/falling edge of
CNTR1 pin input singal. Simultaneousuly, the value in the timer A
latch is reloaded inTimer A and count continues. The active edge
of CNTR1 pin input signal can be selected from rising or falling by
the CNTR1 active edge switch bit .The count value when trigger
input from CNTR1 pin is accepted is retained until Timer A is read
once.
相关PDF资料 |
PDF描述 |
|---|---|
| M38224M6MXXXFP | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP80 |
| M38227MCA-XXXFP | 8-BIT, MROM, 5 MHz, MICROCONTROLLER, PQFP80 |
| MB96F348AWAXXXPMC-GSE2 | 16-BIT, FLASH, 56 MHz, RISC MICROCONTROLLER, PQFP100 |
| MB90348CESPFV | MICROCONTROLLER, PQFP100 |
| MB90F346CESPFV | MICROCONTROLLER, PQFP100 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M37540E8GP#U0 | 功能描述:IC 7540 MCU OTP 32K 32LQFP RoHS:是 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 |
| M37540E8SP | 制造商:Renesas Electronics Corporation 功能描述: |
| M37540E8T-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37540E8T-XXXGP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:8-BIT CISC SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 740 SERIES |
| M37540E8V-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
发布紧急采购，3分钟左右您将得到回复。