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參數(shù)資料
| 型號(hào)： | VMX51C900 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Versa Mix 8051 MCU with LCD Controller and ADC |
| 中文描述： | 8051反之亦然混合與LCD控制器和ADC的微控制器 |
| 文件頁數(shù)： | 18/55頁 |
| 文件大?。?/td> | 2395K |
| 代理商： | VMX51C900 |
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VMX51C900
______________________________________________________________________________________________
www.ramtron.com
page 18 of 55
Timer 2
Timer 2 of the VMX51C900 is a 16-bit Timer/Counter
and is similar to Timers 0 and 1 in that it can operate
either as an event counter or as a timer. This is
controlled by the C/T2 bit in the T2CON special
function register. Timer 2 has three operating modes -
Auto-Load, Capture and Baud Rate Generator. These
modes are selected via the T2CON SFR The following
table describes T2CON special function register bits.
T
ABLE
20:
T
IMER
2
C
ONTROL
R
EGISTER
(T2CON)
–SFR
C8
H
7
6
5
TF2
EXF2
RCLK
Bit
Mnemonic
7
TF2
4
3
2
1
0
TCLK
EXEN2
TR2
C/T2
CP/RL2
Description
Timer 2 Overflow Flag: Set by an overflow
of Timer 2 and must be cleared by
software. TF2 will not be set when either
RCLK =1 or TCLK =1.
Timer 2 external flag change in state occurs
when either a capture or reload is caused
by a negative transition on T2EX and
EXEN2=1. When Timer 2 is enabled,
EXF=1 will cause the CPU to Vector to the
Timer 2 interrupt routine. Note that EXF2
must be cleared by software.
Serial Port Receive Clock Source.
1: Causes Serial Port to use Timer 2
overflow pulses for its receive clock in
modes 1 and 3.
0: Causes Timer 1 overflow to be used for
the Serial Port receive clock.
Serial Port Transmit Clock.
1: Causes Serial Port to use Timer 2
overflow pulses for its transmit clock in
modes 1 and 3.
0: Causes Timer 1 overflow to be used for
the Serial Port transmit clock.
Timer 2 External Mode Enable.
1: Allows a capture or reload to occur as a
result of a negative transition on T2EX if
Timer 2 is not being used to clock the Serial
Port.
0: Causes Timer 2 to ignore events at
T2EX.
Start/Stop Control for Timer 2.
1: Start Timer 2
0: Stop Timer 2
Timer or Counter Select (Timer 2)
1: External event counter falling edge
triggered.
0: Internal Timer (OSC/12)
6
EXF2
5
RCLK
4
TCLK
3
EXEN2
2
TR2
1
C/T2
0
CP/RL2
Capture/Reload Select.
1: Capture of Timer 2 value into RCAP2H,
RCAP2L is performed if EXEN2=1 and a
negative transitions occurs on the T2EX
pin. The capture mode requires RCLK and
TCLK to be 0.
0: Auto-reload reloads will occur either with
Timer 2 overflows or negative transitions at
T2EX when EXEN2=1. When either RCK
=1 or TCLK =1, this bit is ignored and the
timer is forced to auto-reload on Timer 2
overflow.
The Timer 2 mode selection bits and their function are
described in the following table.
T
ABLE
21:
T
IMER
2
M
ODE
S
ELECTION
B
ITS
RCLK + TCLK
CP/RL2 TR2 MODE
0
0
1
16-bit Auto-
Reload Mode
16-bit Capture
Mode
Baud Rate
Generator Mode
Timer 2 stops
0
1
1
1
X
1
X
X
0
The details of each mode are described below.
Timer 2 Capture Mode
In Capture Mode, the EXEN2 bit of the T2CON register
controls whether an external transition on the T2EX pin
will trigger capture of the timer value.
When EXEN2 = 0, Timer 2 acts as a 16-bit timer or
counter, which, upon overflowing, will set the TF2 bit
(Timer 2 overflow bit). This overflow can be used to
generate an interrupt
F
IGURE
9:
T
IMER
2
IN
C
APTURE
M
ODE
F
OSC
÷12
TIMER
COUNTER
C/T2
0
1
T2 pin
TR2
T2EX pin
0
7
0
7
0
7
0
7
Timer 2
Interrupt
EXF2
EXEN2
RCAP2L
RCAP2H
TL2
TH2
TF2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VMX51C900-25-L | 功能描述:8位微控制器 -MCU 8K+256 25MHz 5V 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT |
| VMX51C900-25-LG | 功能描述:8位微控制器 -MCU 8K+256 25MHz 5V 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT |
| VMX51C900-25-L-G | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Versa Mix 8051 MCU with LCD Controller and ADC |
| VMX51C900-25-P | 功能描述:8位微控制器 -MCU 8K+256 25MHz 5V 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT |
| VMX51C900-25-PG | 功能描述:8位微控制器 -MCU 8K+256 25MHz 5V 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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(fēng)格:SMD/SMT |
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