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| 型号： | M37546G2SP |
| 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： | 8.90 X 28 MM, 1.78 MM PITCH, PLASTIC, SDIP-32 |
| 文件页数： | 33/105页 |
| 文件大小： | 1105K |
| 代理商： | M37546G2SP |
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REJ03B0160-0122 Rev.1.22 Mar 13, 2009
page 31 of 100
7546 Group
●Timer A,B
Timer A and Timer B are 16-bit timers and counts the signal which
is the oscillation frequency selected by setting of the timer count
source set register (TCSS). Timer A and Timer B have the same
function except of the count source clock selection.
The count source clock of Timer A is selected from among 1/2,1/
16, 1/32, 1/64, 1/128, 1/256 of f(XIN) clock and on-chip oscillator
clock.
The count source clock of Timer B is selected from among 1/2, 1/
16, 1/32, 1/64, 1/128, 1/256 of f(XIN) clock and Timer A underflow.
Timer A (B) consists of the low-order of Timer A: TAL (Timer B:
TBL) and the high-order of Timer A: TAH (Timer B: TBH). Timer A
(B) is decremented by 1 when each time of the count clock is in-
put. When the contents of Timer A (B) reach “000016”, an
underflow occurs at the next count clock, and the timer latch is re-
loaded into timer. When Timer A (B) underflows, the Timer A (B)
interrupt request bit is set to “1”.
Timer A (B) has the Timer A (B) latch to retain the load value. The
value of timer A (B) latch is set to Timer A (B) at the timing of Timer
A (B) underflow. The division ratio of Timer A (B) is 1/(n+1) pro-
vided that the value of Timer A (B) is n.
When writing to both the low-order of Timer A (B) and the high or-
der of Timer A (B) is executed, writing to “latch only” or “latch and
timer” can be selected by the setting value of the timer A (B) write
control bit.
When reading from Timer A (B) register is executed, the count
value of Timer A (B) is read out.
Be sure to write to/read out the low-order of Timer A (B) and the
high-order of Timer A (B) in the following order;
Read
Read the high-order of Timer A (B) first, and the low-order of Timer
A (B) next and be sure to read both high-order and low-order.
Write
Write to the low-order of Timer A (B) first, and the high-order of
Timer A (B) next and be sure to write both low-order and high or-
der.
Timer A and Timer B can be used for the timing timer of Input cap-
ture and Output compare function.
■ Notes on Timer A, B
(1) Setting of timer value
When “1: Write to only latch” is set to the timer A (B) write control
bit, written data to timer register is set to only latch even if timer is
stopped. Accordingly, in order to set the initial value for timer when
it is stopped, set “0: Write to latch and timer simultaneously” to
timer A (B) write control bit.
(2) Read/write of timer A
Stop timer A to read/write its data when the system is in the follow-
ing state;
CPU operation clock source: XIN oscillation
Timer A count source: On-chip oscillator output
(3) Read/write of timer B
Stop timer B to read/write its data when the system is in the fol-
lowing state;
CPU operation clock source: XIN oscillation
Timer B count source: Timer A underflow
Timer A count source: On-chip oscillator output
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相关代理商/技术参数 |
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| M37546G2SP#U0 | 功能描述:MCU 3/5V 8K 32-SDIP 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) |
| M37546G2-XXXGP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37546G2-XXXHP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37546G2-XXXSP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| M37546G4GP | 功能描述:MCU 2/5V 16K 32-LQFP 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) |
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