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Z51F6412
Product Specification
PS030302-0212
P R E L I M I N A R Y
58
11. Peripheral Hardware
11.1 Clock Generator
11.1.1 Overview
As shown in Figure 11-1, the clock generator produces the basic clock pulses which provide the
system clock to be supplied to the CPU and the peripheral hardware. It contains main-frequency clock
oscillator. The system clock operation can be easily obtained by attaching a crystal between the XIN
and XOUT pin, respectively. The system clock can also be obtained from the external oscillator. In
this case, it is necessary to put the external clock signal into the XIN pin and open the XOUT pin. The
default system clock is INT-RC Oscillator and the default division rate is two. In order to stabilize
system internally, use 1MHz RING oscillator for BIT, WDT and ports de-bounce.
- Calibrated Internal RC Oscillator (16 MHz / ±2%)
. INT-RC OSC/1 (16 MHz)
. INT-RC OSC/2 (8 MHz, Default system clock)
. INT-RC OSC/4 (4 MHz)
. INT-RC OSC/8 (2 MHz)
- Crystal Oscillator (1~10 MHz)
- Sub-Clock Crystal Oscillator (32.768 KHz)
- PLL output (14.75 MHz)
11.1.2 Block Diagram
Main
OSC
X
IN
X
OUT
PDOWN
SUB
OSC
SUB
XIN
SUB
XOUT
WT
System
ClockGen.
WDT
BIT
DCLK
System Clock
Masking Control
BIT
Overflow
SCLK
(Core, System,
Peripherals)
Clock
Change
f
XIN
f
SUB
/ f
PLL
f
INTRC
1/2
1/4
1/8
1/1
PLL
DIV/8
RING-OSC
(1MHz)
PDOWN
WONS
INT-RC
OSC
(16MHz)
f
RING
DIV
Figure 11-1 Clock Generator Block Diagram