參數(shù)資料
型號(hào): SAL-XC866L-4FRA
廠商: INFINEON TECHNOLOGIES AG
元件分類(lèi): 微控制器/微處理器
英文描述: 8-BIT, FLASH, 75 MHz, MICROCONTROLLER, PDSO38
封裝: GREEN, PLASTIC, TSSOP-38
文件頁(yè)數(shù): 72/113頁(yè)
文件大?。?/td> 2289K
代理商: SAL-XC866L-4FRA
SAL-XC866
Functional Description
PRELIMINARY
Data Sheet
57
V1.0, 2011-02
3.8
Clock Generation Unit
The Clock Generation Unit (CGU) allows great flexibility in the clock generation for the
SAL-XC866. The power consumption is indirectly proportional to the frequency, whereas
the performance of the microcontroller is directly proportional to the frequency. During
user program execution, the frequency can be programmed for an optimal ratio between
performance and power consumption. Therefore the power consumption can be
adapted to the actual application state.
Features:
Phase-Locked Loop (PLL) for multiplying clock source by different factors
PLL Base Mode
Prescaler Mode
PLL Mode
Power-down mode support
The CGU consists of an oscillator circuit and a PLL.In the SAL-XC866, the oscillator can
be from either of these two sources: the on-chip oscillator (10 MHz) or the external
oscillator (4 MHz to 12 MHz). The term “oscillator” is used to refer to both on-chip
oscillator and external oscillator, unless otherwise stated. After the reset, the on-chip
oscillator will be used by default.The external oscillator can be selected via software. In
addition, the PLL provides a fail-safe logic to perform oscillator run and loss-of-lock
detection. This allows emergency routines to be executed for system recovery or to
perform system shut down.
Figure 22
CGU Block Diagram
PLL
core
lock
detect
N:1
P:1
fvco
fn
fp
osc fail
detect
OSC
fosc
K:1
fsys
NDIV
OSCR
LOCK
VCOBYP
1
0
OSCDISC
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