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(yè)數(shù)： 16/55頁(yè)
文件大小： 2395K
代理商： VMX51C900
VMX51C900
______________________________________________________________________________________________
www.ramtron.com
page 16 of 55
Timer0 /Timer1 Counter/Timer Functions
Timing Function
When either Timer 0 or 1 is configured to operate as a
timer, its value is automatically incremented at every
system cycle. In the event of an overflow, the overflow
flag is set and the counter is set to zero. The overflow
flags (TF0 and TF1) are located in the TCON register.
The TR0 and TR1 bits of the TCON register gate the
corresponding timer operation. . In order for the timer
to run, the corresponding TRx bit must be set to 1.
The IT0 and IT1 bits of the TCON register control the
event that will trigger an external interrupt as follows:
IT0 = 0: The INT0, if enabled, occurs if a low level is
present on P3.2
IT0 = 1: The INT0, if enabled, occurs if a high to low
transition is detected on P3.2
IT1 = 0: The INT1, if enabled, occurs if a low level is
present on P3.3
IT1 = 1: The INT1, if enabled, occurs if a high to low
transition is detected on P3.3
The IE0 and IE1 bits of the TCON register are external
flags which indicate that a transition has been detected
on the INT0 and INT1 interrupt pins, respectively.
If the external interrupt is configured as edge sensitive,
the corresponding IE0 and IE1 flags are automatically
cleared when the corresponding interrupt is serviced.
If the external interrupt is configured as level sensitive,
the corresponding flag must be cleared by the
software.
T
ABLE
19:
T
IMER
0
AND
1
C
ONTROL
R
EGISTER
(TCON)
–SFR
88
H
7
6
5
TF1
TR1
TF0
Bit
Mnemonic
Description
7
TF1
Timer 1 Overflow Flag. Set by hardware on
Timer/Counter overflow. Cleared 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 hardware 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 Edge Flag. Set by hardware when
external interrupt edge is detected. Cleared
when interrupt processed.
2
IT1
Interrupt 1 Type Control Bit. Set/cleared by
software to specify falling edge/low level
triggered external interrupts.
1
IE0
Interrupt 0 Edge Flag. Set by hardware
when external interrupt edge is detected.
Cleared when interrupt processed.
0
IT0
Interrupt 0 Type control bit. Set/cleared by
software to specify falling edge/low level
triggered external interrupts.
4
3
IE1
2
IT1
1
IE0
0
IT0
TR0
Counting Function
When operating as a counter, the timer register is
incremented at every falling edge of the T0 and T1
signals located at the input of the timers.
When the sampling circuit detects a high immediately
followed by a low in the following machine cycle, the
counter is incremented. Two system cycles are
required to detect and record an event. In order to be
properly sampled, the counting frequency should be
reduced by a factor of 24 (24 times less than the
oscillator’s frequency).
Timer0/Timer1 Operating Modes
The user may change the operating mode via the M1
and M0 bits of the TMOD SFR.
Mode 0
A schematic representation of this mode of operation is
presented in the figure below. In Mode 0, the Timer
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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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