參數(shù)資料
型號: MC68HC705PD6
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 124/165頁
文件大?。?/td> 841K
代理商: MC68HC705PD6
July 7, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05PD6
CLOCK DISTRIBUTION
MOTOROLA
REV 1.1
8-1
SECTION 8
CLOCK DISTRIBUTION
There are two oscillator blocks: OSC and XOSC. Several combinations of the
clock distributions are allowed for the modules in the MC68HC05PD6. Refer to the
following block diagram.
Figure 8-1. Clock Signal Distribution
8.1
OSC CLOCK DIVIDER AND POR COUNTER
The OSC clock is divided by a 7 bit counter which is used for the system clock,
Time Base and POR Counter. Clocks divided by 2, 4, and 64 are available for the
system clock selections and clock divided by 128 is provided for the Time Base
and POR Counter.
The POR counter is a 6 bit clock counter that is driven by the OSC divided by 128.
The overow of this counter is used for setting FTUP bit, release of power on reset
(POR), and resuming operation from STOP mode.
XOSC1
XOSC2
STOP
OSC1
OSC2
1/20
1/21
1/25
SYS1
SYS0
SEL
1/2
OSC DIVIDER
(7 bit)
OSC
XOSC
CLK
CTRL
POR
(6 bit)
TIMEBASE
TIMER2
TIMER1
SCI
CPU
LCD
DRIVER
&
PORTS
WAIT
EXCLK
1/20
1/27
XCLK
FOSCE/
PWRON
SYSTEM
CLOCK
FTUP
1/2
RTC
P-DECODER
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