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参数资料
| 型号： | uPSD3212 |
| 厂商： | 意法半导体 |
| 英文描述： | Flash Programmable System Device with 8032 Microcontroller Core(嵌入高速“8032微控制器核”的Flash型可编程系统器件) |
| 中文描述： | 闪存可编程系统器件与8032微控制器内核（嵌入高速“8032微控制器核”的闪存型可编程系统器件） |
| 文件页数： | 51/155页 |
| 文件大小： | 1055K |
| 代理商： | UPSD3212 |
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μPSD321X
TIMER/COUNTERS (TIMER0, TIMER1 AND TIMER2)
The μPSD321X Devices has three 16-bit Timer/
Counter registers: Timer 0, Timer 1 and Timer2.
All of them can be configured to operate either as
timers or event counters and are compatible with
standard 8032 architecture.
In the “Timer” function, the register is incremented
every machine cycle. Thus, one can think of it as
counting machine cycles. Since a machine cycle
consists of 6 CPU clock periods, the count rate is
1/6 of the CPU clock frequency.
In the “Counter” function, the register is increment-
ed in response to a 1-to-0 transition at its corre-
sponding external input pin, T0 or T1. In this
function, the external input is sampled during
S5P2 of every machine cycle. When the samples
show a high in one cycle and a low in the next cy-
cle, the count is incremented. The new count value
appears in the register during S2P1 of the cycle
following the one in which the transition was de-
tected. Since it takes 2 machine cycles (12 CPU
clock periods) to recognize a 1-to-0 transition, the
maximum count rate is 1/12 of the CPU clock fre-
quency. There are no restrictions on the duty cycle
of the external input signal, but to ensure that a
given level is sampled at least once before it
changes, it should be held for at least one full cy-
cle. In addition to the “Timer” or “Counter” selec-
tion, Timer0 and Timer1 have four operating
modes from which to select.
Timer0 and Timer1
The “Timer” or “Counter” function is selected by
control bits C/ T in the Special Function Register
TMOD. These Timer/Counters have four operat-
ing modes, which are selected by bit-pairs (M1,
M0) in TMOD. Modes 0, 1, and 2 are the same for
Timers/ Counters. Mode 3 is different. The four op-
erating modes are de-scribed in the following text.
Table 36. Control Register (TCON)
Table 37. Description of the TCON Bits
7
6
5
4
3
2
1
0
TF1
TR1
TF0
TR0
IE1
IT1
IE0
IT0
Bit
Symbol
Function
7
TF1
Timer 1 overflow flag. Set by hardware on Timer/Counter overflow. Cleared by hardware
when processor vectors to interrupt routine
6
TR1
Timer 1 run control bit. Set/cleared by software to turn Timer/Counter on or off
5
TF0
Timer 0 overflow flag. Set by hardier on Timer/Counter overflow. Cleared by hardware
when processor vectors to interrupt routine
4
TR0
Timer 0 run control bit. Set/cleared by software to turn Timer/Counter on or off
3
IE1
Interrupt 1 Edge flag. Set by hardware when external interrupt edge detected. Cleared
when interrupt processed
2
IT1
Interrupt 1 Type control bit. Set/cleared by software to specify falling-edge/low-level
triggered external interrupt
1
IE0
Interrupt 0 Edge flag. Set by hardware when external interrupt edge detected. Cleared
when interrupt processed
0
IT0
Interrupt 0 Type control bit. Set/cleared by software to specify falling-edge/low-level
triggered external interrupt
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相关代理商/技术参数 |
参数描述 |
|---|---|
| UPSD3212A | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 MCU with USB and Programmable Logic |
| UPSD3212A-24T6T | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 MCU with USB and Programmable Logic |
| UPSD3212A-24U6T | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 MCU with USB and Programmable Logic |
| UPSD3212A-40T6 | 功能描述:8位微控制器 -MCU Flash Programmable System Devices 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 |
| UPSD3212A-40T6T | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Flash Programmable System Devices with 8032 MCU with USB and Programmable Logic |
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