參數(shù)資料
型號: MC68HC05PD6
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封裝: PLASTIC, TQFP-80
文件頁數(shù): 130/165頁
文件大小: 841K
代理商: MC68HC05PD6
July 7, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05PD6
CLOCK DISTRIBUTION
MOTOROLA
REV 1.1
8-7
T2R1/0 – Timer 2 Prescale Rate select bits
T2R1 and T2R0 select Timer 2 clock rate. See Section 9 for a detailed
description.
8.4.5 Time Base Control Register 2 (TBCR2)
RTI1/0 – Real Time Interrupt Rate Select
The RTR1 and RTR0 bits select one of four rates for the Real Time Interrupt
period. The RTI rate is related to the COP time-out reset period. These bits are
set to 1 on reset.
COPE – COP Enable
When the COPE bit is 1, COP reset function is enabled. This bit is cleared on
reset (including COP time-out reset) and write to this bit is allowed only once
after rest.
8.5
REAL TIME CLOCK (RTC)
Real time clock is software programmable which can be either enabled or
disabled. Real time clock consists of three binary counters which are divided
down from the 76.8KHz oscillator. There are three bits in the RTC status register
(address $39) and three bits in the RTC Control register (address $3A) where the
operation of the real time clock is controlled.
8.5.1 RTC Time Registers
Three locations are reserved for real time clock operation; they are:
RT1
RT0
DIVIDE RATIO
OSC=4MHz
OSC=4.1943MHz
XOSC=76.8kHz
0
TBCLK
÷ 128
244Hz
256Hz
600Hz
0
1
TBCLK
÷ 4096
7.63Hz
8Hz
18.75Hz
1
0
TBCLK
÷ 8192
3.81Hz
4Hz
9.38Hz
1
TBCLK
÷ 16384
1.91Hz
2Hz
4.69Hz
W
R
TBCR2
$0011
reset
0
7
11
54
X
0000
6
3210
0
RTR0
RTR1
0
COPE
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