- 您现在的位置：买卖IC网 > PDF目录98144 > ST72121J2T6/XXX (STMICROELECTRONICS) 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44 PDF资料下载
参数资料
| 型号： | ST72121J2T6/XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | PLASTIC, TQFP-44 |
| 文件页数： | 29/87页 |
| 文件大小： | 1365K |
| 代理商： | ST72121J2T6/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页当前第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
35/87
ST72121
16-BIT TIMER (Cont’d)
4.3.3.3 Input Capture
In this section, the index,
i, may be 1 or 2.
The two input capture 16-bit registers (IC1R and
IC2R) are used to latch the value of the free run-
ning counter after a transition detected by the
ICAP
i pin (see figure 5).
IC
i Rregister is a read-only register.
The active transition is software programmable
through the IEDG
i bitofthe ControlRegister (CRi).
Timing resolution is one count of the free running
counter: (
fCPU/(CC1.CC0)).
Procedure
To use the input capture function select the follow-
inginthe CR2 register:
– Select the timer clock (CC1-CC0) (see Table
14).
– Select the edge of the active transition on the
ICAP2 pin with the IEDG2 bit.
And select the following in the CR1 register:
– Set the ICIE bit to generate an interrupt after an
input capture.
– Select the edge of the active transition on the
ICAP1 pin with the IEDG1 bit.
When an input capture occurs:
–ICF
i bit is set.
–The IC
iR register contains the value of the free
runningcounter on theactivetransitiononthe
ICAP
i pin (see Figure 25).
– A timer interrupt is generated if the ICIE bit is set
and the I bit is cleared in the CC register. Other-
wise, the interrupt remains pending until both
conditions become true.
Clearing the Input Capture interrupt request is
done in two steps:
1. Reading the SR register while the ICF
i bit is set.
2. An access (read or write) to the IC
iLR register.
Note: After reading the IC
iHR register, transfer of
input capture data is inhibited until the IC
iLR regis-
ter is also read.
The IC
iR register always contains the free running
counter value which corresponds to the most re-
cent input capture.
During HALT mode, if at least one valid input cap-
ture edge occurs on the ICAP
i pin, the input cap-
ture detection circuitry is armed. This does not set
any timer flags, and does not “wake-up” the MCU.
If the MCU is awoken by an interrupt, the input
capture flag will become active, and data corre-
sponding to the first valid edge during HALT mode
will be present.
MS Byte
LS Byte
ICiR
IC
iHR
IC
iLR
35
相关PDF资料 |
PDF描述 |
|---|---|
| ST72141K2B3/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32 |
| ST72311N4T6/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64 |
| ST72311J2B6/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP42 |
| ST72311N2T3/XXX | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64 |
| ST72321BAR7T6 | MICROCONTROLLER, QFP64 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST72121J4 | 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 8 TO 16 K ROM/OTP/EPROM. 384 TO 512 BYTES RAM. WDG. SCI. SPI & 2 TIMERS - SDIP42. TQFP44 |
| ST72124J | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| ST72124J2 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| ST72124J2B | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
| ST72124J2B1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES |
发布紧急采购，3分钟左右您将得到回复。