參數(shù)資料
型號(hào)： SAB80C517A-N18
廠商： SIEMENS A G
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-Bit CMOS Single-Chip Microcontroller
中文描述： 8-BIT, 18 MHz, MICROCONTROLLER, PQCC84
文件頁(yè)數(shù)： 36/77頁(yè)
文件大?。?/td> 1358K
代理商： SAB80C517A-N18
SAB 80C517A/83C517A-5
Semiconductor Group
35
1994-05-01
Compare/Capture Unit (CCU)
The compare/capture unit is a complex timer/register array for applications that require high
speed I/O pulse width modulation and more timer/counter capabilities.
The CCU contains
– one 16-bit timer/counter
(timer2)
with 2-bit prescaler, reload capability and a max. clock
frequency of
f
OSC/12
(1 MHz with a 12 MHz crystal).
– one 16-bit timer
(compare timer)
with 8-bit prescaler, reload capability and a max. clock
frequency of
f
OSC/2
(6 MHz with a 12 MHz crystal).
– fifteen 16-bit compare registers.
– five of which can be used as 16-bit capture registers.
– up to 21 output lines controlled by the CCU.
– nine interrupts which can be generated by CCU-events.
Figure 5 shows a block diagram of the CCU. Eight compare registers (CM0 to CM7) can
individually be assigned to either timer 2 or the compare timer. Diagrams of the two timers are
shown in figures 6 and 7. The four compare/capture registers, the compare/reload/capture
register and the comset/comclr register are always connected to timer 2. Depending on the
register type and the assigned timer three different compare modes can be selected.
Table 3 illustrates possible combinations and the corresponding output lines.
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