- 您现在的位置：买卖IC网 > PDF目录98143 > ST6240BQ6/XXX (STMICROELECTRONICS) 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP80 PDF资料下载
参数资料
| 型号： | ST6240BQ6/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | PLASTIC, QFP-80 |
| 文件页数： | 32/73页 |
| 文件大小： | 1963K |
| 代理商： | ST6240BQ6/XXX |
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页当前第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
Obsolete
Product(s)
- Obsolete
Product(s)
Obsolete
Product(s)
- Obsolete
Product(s)
38/73
ST62T40B/E40B
4.2 TIMER 1 & 2
The MCU features two on-chip Timer peripheral
named TIMER 1 & TIMER 2. Each of these timers
consist of an 8-bit counter with a 7-bit programma-
ble prescaler, giving a maximum count of 215.
Figure 22 and Figure 23 show the Timer Block Di-
agrams. An external TIMER pin is available to the
user on the TIMER 1 allowing external control of
the counting clock or signal generation.
The content of the 8-bit counter can be read/writ-
ten in the Timer/Counter register, TCR, while the
state of the 7-bit prescaler can be read in the PSC
register. The control logic device is managed in
the TSCR register as described in the following
paragraphs.
The 8-bit counter is decremented by the output
(rising edge) coming from the 7-bit prescaler and
can be loaded and read under program control.
When it decrements to zero then the TMZ (Timer
Zero) bit in the TSCR is set to “1”. If the ETI (Ena-
ble Timer Interrupt) bit in the TSCR is also set to
“1”, an interrupt request is generated as described
in the Interrupt Chapter. The Timer interrupt can
be used to exit the MCU from WAIT mode.
The prescaler input can be either the internal fre-
quency fINT divided by 12 (TIMER 1 & 2) or an ex-
ternal clock applied to the TIMER pin (TIMER 1).
The prescaler decrements on the rising edge. De-
pending on the division factor programmed by
PS2, PS1 and PS0 bits in the TSCR. The clock in-
put of the timer/counter register is multiplexed to
different sources. For division factor 1, the clock
input of the prescaler is also that of timer/counter;
for factor 2, bit 0 of the prescaler register is con-
nected to the clock input of TCR. This bit changes
its state at half the frequency of the prescaler input
clock. For factor 4, bit 1 of the PSC is connected to
the clock input of TCR, and so forth. The prescaler
initialize bit, PSI, in the TSCR register must be set
to “1” to allow the prescaler (and hence the coun-
ter) to start. If it is cleared to “0”, all the prescaler
bits are set to “1” and the counter is inhibited from
counting. The prescaler can be loaded with any
value between 0 and 7Fh, if bit PSI is set to “1”.
The prescaler tap is selected by means of the
PS2/PS1/PS0 bits in the control register.
Figure 21 illustrates the Timer’s working principle.
Figure 21. Timer Working Principle
BIT0
BIT1
BIT2
BIT3
BIT6
BIT5
BIT4
CLOCK
7-BIT PRESCALER
8-1 MULTIPLEXER
8-BIT COUNTER
BIT0
BIT1
BIT2
BIT3
BIT4
BIT5
BIT6
BIT7
1
02
3
4
5
6
7
PS0
PS1
PS2
VA00186
38
相关PDF资料 |
PDF描述 |
|---|---|
| ST6242BQ1/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64 |
| ST6246BB6/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP56 |
| ST6260BB6 | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP20 |
| ST6294B8/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP28 |
| ST62T94B8 | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDIP28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST6240-P/QFP | 功能描述:插座和适配器 ST62 P/QFP Adaptor RoHS:否 制造商:Silicon Labs 产品:Adapter 用于:EM35x |
| ST6240Q1/XX | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| ST6240Q6/XX | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-Bit Microcontroller |
| ST6242 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT OTP/EPROM MCU WITH LCD DRIVER, EEPROM AND A/D CONVERTER |
| ST6242B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:8-BIT MICROCONTROLLER ( MCU ) WITH OTP. ROM. FASTROM. EPROM. LCD DRIVER. EEPROM. A/D CONVERTER AND 64 PINS |
发布紧急采购，3分钟左右您将得到回复。