mg82fel308 Megawin Technology, mg82fel308 Datasheet - Page 39

• Manufacturer Part Number: mg82fel308
• Description: A Single-chip Microcontroller Based On A High Performance 1-t Architecture 80c51
• Manufacturer: Megawin Technology

12. Timers/Counters
MG82FE(L)308/316 has four Timers/Counters: Timer 0, Timer 1, Timer 2 and PWM Timer. Timer0/1/2 can be
configured as timers or event counters. PWM Timer can be configured as timer or PWM generator.
In the “timer” function, the timer rate is prescaled by 12 clock cycle to increment register value. In other words, it
is to count the standard C51 machine cycle. AUXR2.T0X12, AUXR2.T1X12 and T2MOD.T2X12 are the function
for Timer 0/1/2 to set the timer rate on every clock cycle.
In the “counter” function, the register is incremented in response to a 1-to-0 transition at its corresponding
external input pin, T0, T1 or T2. In this function, the external input is sampled by every timer rate cycle. When the
samples show a high in one cycle and a low in the next cycle, the count is incremented. The new count value
appears in the register at the end of the cycle following the one in which the transition was detected.
12.1. Timer0 and Timer1
12.1.1. Mode 0 Structure
The timer register is configured as a 13-bit register. As the count rolls over from all 1s to all 0s, it sets the timer
interrupt flag TFx. The counted input is enabled to the timer when TRx = 1 and either GATE=0 or INTx = 1. Mode
0 operation is the same for Timer0 and Timer1.
This document information is the intellectual property of Megawin Technology.
© Megawin Technology Co., Ltd. 2009 All rights reserved.
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SYSCLK
SYSCLK
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12
nINTx Pin
Tx Pin
GATE
TRx
AUXR2.TxX12=0
AUXR2.TxX12=1
C/T=0
C/T=1
TLx[4:0]
THx[7:0]
MG82FE(L)308/316
Overflow
Preliminary, v 0.04
TFx
x = 0 or 1
Interrupt