參數(shù)資料
型號: ST72F321M
廠商: 意法半導體
英文描述: 80-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE(具有ICP,IAP,Nested Interrupt,TLI,ROP的8位MCU)
中文描述: 80引腳8位微控制器32至60,000閃存/ ROM,ADC的,5個定時器,SPI和SCI的I2C接口(具有比較方案,國際檢察官聯(lián)合會,嵌套中斷,中華語文研習所,人事登記的8位微控制器)
文件頁數(shù): 71/178頁
文件大?。?/td> 3121K
代理商: ST72F321M
ST72F321M, ST72321BM
71/178
16-BIT TIMER
(Cont’d)
9.4.3.4 Output Compare
In this section, the index,
i
, may be 1 or 2 because
there are two output compare functions in the 16-
bit timer.
This function can be used to control an output
waveform or indicate when a period of time has
elapsed.
When a match is found between the Output Com-
pare register and the free running counter, the out-
put compare function:
– Assigns pins with a programmable value if the
OC
i
E bit is set
– Sets a flag in the status register
– Generates an interrupt if enabled
Two 16-bit registers Output Compare Register 1
(OC1R) and Output Compare Register 2 (OC2R)
contain the value to be compared to the counter
register each timer clock cycle.
These registers are readable and writable and are
not affected by the timer hardware. A reset event
changes the OC
i
R value to 8000h.
Timing resolution is one count of the free running
counter: (
f
CPU/
CC[1:0]
).
Procedure:
To use the output compare function, select the fol-
lowing in the CR2 register:
– Set the OC
i
E bit if an output is needed then the
OCMP
i
pin is dedicated to the output compare
i
signal.
– Select the timer clock (CC[1:0]) (see
Table 1
).
And select the following in the CR1 register:
– Select the OLVL
i
bit to applied to the OCMP
i
pins
after the match occurs.
– Set the OCIE bit to generate an interrupt if it is
needed.
When a match is found between OCRi register
and CR register:
– OCF
i
bit is set.
– The OCMP
i
pin takes OLVL
i
bit value (OCMP
i
pin latch is forced low during reset).
– A timer interrupt is generated if the OCIE bit is
set in the CR1 register and the I bit is cleared in
the CC register (CC).
The OC
i
R register value required for a specific tim-
ing application can be calculated using the follow-
ing formula:
Where:
t
f
CPU
PRESC
= Timer prescaler factor (2, 4 or 8 de-
pending on CC[1:0] bits, see
Table 1
)
= Output compare period (in seconds)
= CPU clock frequency (in hertz)
If the timer clock is an external clock, the formula
is:
OC
i
R =
t
*
f
EXT
Where:
t
f
EXT
= Output compare period (in seconds)
= External timer clock frequency (in hertz)
Clearing the output compare interrupt request
(that is, clearing the OCF
i
bit) is done by:
1. Reading the SR register while the OCF
i
bit is
set.
2. An access (read or write) to the OC
i
LR register.
The following procedure is recommended to pre-
vent the OCF
i
bit from being set between the time
it is read and the write to the OC
i
R
register:
– Write to the OC
i
HR register (further compares
are inhibited).
– Read the SR register (first step of the clearance
of the OCF
i
bit, which may be already set).
– Write to the OC
i
LR register (enables the output
compare function and clears the OCF
i
bit).
MS Byte
OC
i
HR
LS Byte
OC
i
LR
OC
i
R
OC
i
R =
t
*
f
CPU
PRESC
相關PDF資料
PDF描述
ST72321BM 80-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE(具有ICP,IAP,Nested Interrupt,TLI,ROP的8位MCU)
ST72F321 64/44-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE
ST72F321J7T6 64/44-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE
ST72F321J7TA 64/44-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE
ST72F321AR6T6 64/44-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE
相關代理商/技術參數(shù)
參數(shù)描述
ST72F321M6T6 制造商:STMicroelectronics 功能描述:
ST72F321M7T6 制造商:STMicroelectronics 功能描述:8-BIT FLASH MICROCONTROLLER - Bulk
ST72F321M9T6 功能描述:MCU 8BIT 60KB FLASH/ROM 80-LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:ST7 標準包裝:96 系列:PIC® 16F 核心處理器:PIC 芯體尺寸:8-位 速度:20MHz 連通性:I²C,SPI 外圍設備:欠壓檢測/復位,POR,PWM,WDT 輸入/輸出數(shù):11 程序存儲器容量:3.5KB(2K x 14) 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:128 x 8 電壓 - 電源 (Vcc/Vdd):2.3 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:14-TSSOP(0.173",4.40mm 寬) 包裝:管件
ST72F321R6T6 功能描述:8位微控制器 -MCU Flash 32K SPI/SCI/I2 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
ST72F321R6T6TR 功能描述:8位微控制器 -MCU 8B MCU RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT