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參數(shù)資料
| 型號(hào)： | UPSD3253B-40T6 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP52 |
| 封裝： | PLASTIC, TQFP-52 |
| 文件頁數(shù)： | 149/189頁 |
| 文件大小： | 1638K |
| 代理商： | UPSD3253B-40T6 |
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Obsolete
Product(s)
- Obsolete
Product(s)
Timer/counters (Timer 0, Timer 1 and Timer 2)
UPSD3254A, UPSD3254BV, UPSD3253B,
11.1.4
Mode 3
Timer 1 in Mode 3 simply holds its count. The effect is the same as setting TR1 = 0.
Timer 0 in Mode 3 establishes TL0 and TH0 as two separate counters. The logic for Mode 3
on Timer 0 is shown in Figure 23. TL0 uses the Timer 0 control Bits: C/T, GATE, TR0, INT0,
and TF0. TH0 is locked into a timer function (counting machine cycles) and takes over the
use of TR1 and TF1 from Timer 1. Thus, TH0 now controls the “Timer 1“ Interrupt.
Mode 3 is provided for applications requiring an extra 8-bit timer on the counter. With Timer
0 in Mode 3, an UPSD325xx devices can look like it has three Timer/Counters. When Timer
0 is in Mode 3, Timer 1 can be turned on and off by switching it out of and into its own Mode
3, or can still be used by the serial port as a baud rate generator, or in fact, in any application
not requiring an interrupt.
Figure 23.
Timer/counter mode 3: two 8-bit counters
11.2
Timer 2
Like Timers 0 and 1, Timer 2 can operate as either an event timer or as an event counter.
This is selected by Bit C/T2 in the special function register T2CON. It has three operating
modes: Capture, Auto-reload, and Baud Rate Generator, which are selected by bits in the
T2CON as shown in Table 41. In the Capture mode there are two options which are selected
by Bit EXEN2 in T2CON. if EXEN2 = 0, then Timer 2 is a 16-bit timer or counter which upon
overflowing sets Bit TF2, the Timer 2 Overflow bit, which can be used to generate an
interrupt. If EXEN2 = 1, then Timer 2 still does the above, but with the added feature that a
1-to-0 transition at external input T2EX causes the current value in the Timer 2 registers,
TL2 and TH2, to be captured into registers RCAP2L and RCAP2H, respectively. In addition,
the transition at T2EX causes Bit EXF2 in T2CON to be set, and EXF2 like TF2 can
generate an interrupt. The Capture mode is illustrated in Figure 24.
In the Auto-reload mode, there are again two options, which are selected by bit EXEN2 in
T2CON. If EXEN2 = 0, then when Timer 2 rolls over it not only sets TF2 but also causes the
Timer 2 registers to be reloaded with the 16-bit value in registers RCAP2L and RCAP2H,
which are preset by software. If EXEN2 = 1, then Timer 2 still does the above, but with the
added feature that a 1-to-0 transition at external input T2EX will also trigger the 16-bit reload
AI06624
fOSC
TF0
Interrupt
Gate
TR0
INT0 pin
T0 pin
Control
TL0
(8 bits)
C/T = 0
C/T = 1
÷ 12
fOSC
TF1
Interrupt
Control
TH1
(8 bits)
÷ 12
TR1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UPSD3334D-40U6 | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP80 |
| US1001FL | 0.5 A, 100 V, SILICON, SIGNAL DIODE |
| US1A-HE3 | 1 A, 50 V, SILICON, SIGNAL DIODE, DO-214AC |
| US1B-HE3 | 1 A, 100 V, SILICON, SIGNAL DIODE, DO-214AC |
| US1G-HE3 | 1 A, 400 V, SILICON, SIGNAL DIODE, DO-214AC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPSD3253B-40T6T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3253B-40U1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3253B-40U1T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3253B-40U6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
| UPSD3253B-40U6T | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Flash Programmable System Device with 8032 Microcontroller Core |
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