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| 型号： | ST72C314J4B1XXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP42 |
| 封装： | 0.600 INCH, PLASTIC, SDIP-42 |
| 文件页数： | 104/153页 |
| 文件大小： | 2235K |
| 代理商： | ST72C314J4B1XXX |
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ST72334J/N, ST72314J/N, ST72124J
54/153
14.3 16-BIT TIMER
14.3.1 Introduction
The timer consists of a 16-bit free-running counter
driven by a programmable prescaler.
It may be used for a variety of purposes, including
measuring the pulse lengths of up to two input sig-
nals (
input capture) or generating up to two output
waveforms (
output compare and PWM).
Pulse lengths and waveform periods can be mod-
ulated from a few microseconds to several milli-
seconds using the timer prescaler and the CPU
clock prescaler.
Some ST7 devices have two on-chip 16-bit timers.
They are completely independent, and do not
share any resources. They are synchronized after
a MCU reset as long as the timer clock frequen-
cies are not modified.
This description covers one or two 16-bit timers. In
ST7 devices with two timers, register names are
prefixed with TA (Timer A) or TB (Timer B).
14.3.2 Main Features
s
Programmable prescaler: fCPU divided by 2, 4 or 8.
s
Overflow status flag and maskable interrupt
s
External clock input (must be at least 4 times
slower than the CPU clock speed) with the choice
of active edge
s
Output compare functions with:
– 2 dedicated 16-bit registers
– 2 dedicated programmable signals
– 2 dedicated status flags
– 1 dedicated maskable interrupt
s
Input capture functions with:
– 2 dedicated 16-bit registers
– 2 dedicated active edge selection signals
– 2 dedicated status flags
– 1 dedicated maskable interrupt
s
Pulse Width Modulation mode (PWM)
s
One Pulse mode
s
5 alternate functions on I/O ports (ICAP1, ICAP2,
OCMP1, OCMP2, EXTCLK)*
The Block Diagram is shown in Figure 31.
*Note: Some timer pins may not be available (not
bonded) in some ST7 devices. Refer to the device
pin out description.
When reading an input signal on a non-bonded
pin, the value will always be ‘1’.
14.3.3 Functional Description
14.3.3.1 Counter
The main block of the Programmable Timer is a
16-bit free running upcounter and its associated
16-bit registers. The 16-bit registers are made up
of two 8-bit registers called high & low.
Counter Register (CR):
– Counter High Register (CHR) is the most sig-
nificant byte (MS Byte).
– Counter Low Register (CLR) is the least sig-
nificant byte (LS Byte).
Alternate Counter Register (ACR)
– Alternate Counter High Register (ACHR) is the
most significant byte (MS Byte).
– Alternate Counter Low Register (ACLR) is the
least significant byte (LS Byte).
These two read-only 16-bit registers contain the
same value but with the difference that reading the
ACLR register does not clear the TOF bit (Timer
overflow flag), located in the Status register (SR).
(See note at the end of paragraph titled 16-bit read
sequence).
Writing in the CLR register or ACLR register resets
the free running counter to the FFFCh value.
Both counters have a reset value of FFFCh (this is
the only value which is reloaded in the 16-bit tim-
er). The reset value of both counters is also
FFFCh in One Pulse mode and PWM mode.
The timer clock depends on the clock control bits
of the CR2 register, as illustrated in Table 14 Clock
Control Bits. The value in the counter register re-
peats every 131072, 262144 or 524288 CPU clock
cycles depending on the CC[1:0] bits.
The timer frequency can be fCPU/2, fCPU/4, fCPU/8
or an external frequency.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ST72C314J4B6 | 功能描述:8位微控制器 -MCU Flash 16K SPI/SCI RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| ST72C314J4T1 | 制造商:STMicroelectronics 功能描述:ST72FLASH 8K - Bulk |
| ST72C314J4T6 | 功能描述:8位微控制器 -MCU Flash 16K SPI/SCI RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| ST72C314J4T6 PROGRAMMED | 制造商:STMicroelectronics 功能描述:MCU 8-bit ST7 CISC 16KB Flash 3.3V/5V 44-Pin TQFP Tray |
| ST72C314J4T6E | 制造商:STMicroelectronics 功能描述:16K TQFP44 LEADFREE - Trays |
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