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參數(shù)資料
| 型號： | C508 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-Bit CMOS Microcontroller |
| 中文描述： | 8位CMOS微控制器 |
| 文件頁數(shù)： | 40/93頁 |
| 文件大?。?/td> | 1204K |
| 代理商： | C508 |
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C508
Data Sheet
36
2000-08
Compare (COMP) Unit Operation
The Capture/Compare Unit CCU of the C508 also provides a 10-bit Compare Unit
(COMP) which operates as a single channel pulse generator with a pulse width
modulated output signal. This output signal is available at the output pin COUT3 of the
C508. In the combined multi-channel PWM modes and in burst mode of the CAPCOM
unit the output signal of the COMP unit can also be switched to the output signals COUTx
or CCx.
Figure 16
shows the block diagram and the pulse generation scheme of the
COMP unit.
Figure 16
COMP Unit: Block Diagram and Pulse Generation Scheme
The COMP unit has a 10-bit up-counter (Compare Timer 2, CT2) which starts counting
from 000
H
up to the value stored in the period register and then is again reset. This
Compare Timer 2 operation is equal to the operating mode 0 of Compare Timer 1. When
the count value of CT2 matches the value stored in the compare registers CMP2H/
CMP2L, COUT3 toggles its logic state. When Compare Timer 2 is reset to 000
H
, COUT3
toggles again its logic state.
In the combined multi-channel PWM modes and in the burst mode, the Compare Timer 2
output signal can also be switched to the CAPCOM output pins COUT0, COUT1, and
COUT3. In these modes, the polarity of the modulated output signal at COUT2-0 can be
inverted by setting bit COUTXI (COINI.6)
Combined Multi-Channel PWM Modes
The CCU of the C508 has been designed to support also motor control or inverter
applications which have a demand for specific multi-channel PWM signal generation. In
these combined multi-channel PWM modes the CAPCOM unit (Compare Timer 1) and
the COMP unit (Compare Timer 2) of the C508 CCU are working together.
MCB04101
Programmable
Prescaler
Period Registers
CP2H/CP2L
Compare Timer 2
10-Bit Up Counter
Control Register
CT2CON
Comparator
Compare Registers
CMP2H/CMP2L
Pulse
Generation
Match
Port
Pin
COUT3
COUTXI
(COINI.6)
COUT3I
(COINI.7)
2
f
OSC
ECT20
To CAPCOM
Output Control
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