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參數(shù)資料
| 型號： | M44C892-H |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20 |
| 封裝： | SSO-20 |
| 文件頁數(shù)： | 31/84頁 |
| 文件大?。?/td> | 648K |
| 代理商： | M44C892-H |
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M44C892–H
M44C892–H
M44C092–H
Rev. A2, 14-Dec-01
37 (84)
Timer 2 output mode 7: PWM mode: Pulse–width modulation output on Timer 2 output pin (T2O)
In this mode the timer overflow defines the period and the compare register defines the duty cycle. During one period
only the first compare match occurence is used to toggle the timer output flip-flop, until the overflow all further
compare match are ignored. This avoids the situation that changing the compare register causes the occurence of sev-
eral compare match during one period. The resolution at the pulse-width modulation Timer 2 mode 1 is 12-bit and all
other Timer 2 modes are 8-bit.
0
50
255
100
0
255 0
150
255 0 50
255 0
100
T2R
Input clock
Counter 2/2
OVF2
CM2
INT4
T2O
load the next
compare value
T2CO2=150
load
T1
T2
T3
T1
T2
TT
T
13788
Figure 42. PWM modulation
Timer 2 Registers
Timer 2 has 6 control registers to configure the timer mode, the time interval, the input clock and its output function.
All registers are indirectly addressed using extended addressing as described in section ”Addressing peripherals”. The
alternate functions of the Ports BP41 or BP42 must be selected with the Port 4 control register P4CR, if one of the
Timer 2 modes require an input at T2I/BP41 or an output at T2O/BP42.
Timer 2 Control Register (T2C)
Address: ’7’hex – Subaddress: ’0’hex
Bit 3
Bit 2
Bit 1
Bit 0
T2C
T2CS1
T2CS0
T2TS
T2R
Reset value: 0000b
T2CS1
Timer 2 Clock Select bit 1
T2CS1
T2CS0
Input Clock (CL 2/1) of
Counter Stage 2/1
T2CS0
Timer 2 Clock Select bit 0
0
0
System clock (SYSCL)
0
1
Output signal of Timer 1 (T1OUT)
1
0
Internal shift clock of SSI (SCL)
1
1
Output signal of Timer 3 (TOG3)
T2TS
Timer 2 Toggle with Start
T2TS = 0, the output flip-flop of Timer 2 is not toggled with the timer start
T2TS = 1, the output flip-flop of Timer 2 is toggled when the timer is started with T2R
T2R
Timer 2 Run
T2R = 0, Timer 2 stop and reset
T2R = 1, Timer 2 run
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