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參數資料
| 型號： | M44C892 |
| 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： | 27/84頁 |
| 文件大?。?/td> | 643K |
| 代理商： | M44C892 |
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M44C892
M44C892
M44C092
Rev. A5, 14-Dec-01
33 (84)
Mode 2: 8-bit compare counter with 4-bit programmable prescaler
4-bit counter
4-bit compare
RES
4-bit register
CM1
POUT
8-bit counter
8-bit compare
8-bit register
OVF2
CM2
RES
T2RM
T2OTM
Timer 2
output mode
and T2OTM–bit
T2IM
T2CTM
TOG2
INT4
CL2/1
13778
DCG
T2D1, 0
DCGO
Figure 32. 8-bit compare counter
The 4-bit stage is used as programmable prescaler for the 8-bit counter stage. In this mode, a duty cycle stage is also
available. This stage can be used as an additional 2-bit prescaler or for generating duty cycles of 25%, 33% and 50%.
The 4-bit compare output (CM1) supplies the clock output (POUT) with clocks.
Mode 3/4: 8-bit compare counter and 4-bit programmable prescaler
4-bit counter
4-bit compare
RES
4-bit register
8-bit counter
8-bit compare
8-bit register
OVF2
CM2
RES
T2RM
T2OTM
Timer 2
output mode
and T2OTM–bit
T2IM
T2CTM
TOG2
INT4
CL2/2
13779
DCG
T2D1, 0
DCGO
P41M2, 1
P4CR
CM1
POUT
CL2/1
MUX
TOG3
T1OUT
SYSCL
SCL
T2CS1, 0
SYSCL
T2I
Figure 33. 4-/8-bit compare counter
In these modes the 4-bit and the 8-bit counter stages work
independently as a 4-bit prescaler and an 8-bit timer with
an 2-bit prescaler or as a duty cycle generator. Only in the
mode 3 and mode 4, can the 8-bit counter be supplied via
the external clock input (T2I) which is selected via the
P4CR register. The 4-bit prescaler is started via activating
of mode 3 and stopped and reset in mode 4. Changing
mode 3 and 4 has no effect for the 8-bit timer stage. The
4-bit stage can be used as prescaler for Timer 3, the SSI
or to generate the stop signal for modulator 2 and
modulator 3.
Timer 2 Output Modes
The signal at the timer output is generated via
modulator 2. In the toggle mode, the compare match
event toggles the output T2O. For high resolution duty
cycle modulation 8 bits or 12 bits can be used to toggle the
output. In the duty cycle burst modulator modes the DCG
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