參數(shù)資料
型號(hào)： MC68HC705CL4FU
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 1.84 MHz, MICROCONTROLLER, PQFP80
封裝： QFP-80
文件頁數(shù)： 55/101頁
文件大?。?/td> 517K
代理商： MC68HC705CL4FU
February 12, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05CL4
TIMERS
MOTOROLA
REV 2.0
8-15
NOTE
Care should be taken when altering RT0 and RT1 if the time-out period is
imminent or uncertain. If the selected tap is modied during a cycle in which the
counter is switching, an RTIF could be missed or an additional one could be
generated. To avoid problems, the COP should be cleared before changing RTI
taps.
8.2.3 Ctimer Counter Register (CTCR)
The Core Timer Counter Register is a read-only register which contains the cur-
rent value of the 8-bit ripple counter at the beginning of the timer chain. This
counter is clocked at fop divided by 4 and can be used for various functions includ-
ing a software input capture. Extended time periods can be attained using the
TOF function to increment a temporary RAM storage location thereby simulating a
16-bit (or more) counter.
The power-on cycle clears the entire counter chain and begins clocking the
counter. After 4064 cycles, the power-on reset circuit is released which again
clears the counter chain and allows the device to come out of reset. At this point, if
RESET is not asserted, the timer will start counting up from zero and normal
device operation will begin. When RESET is asserted anytime during operation
(other than POR), the counter chain will be cleared.
8.2.4 Operation during Low Power Mode
The timer is cleared when going into STOP mode. When STOP is exited by an
external interrupt or an external RESET, the internal oscillator will resume, fol-
lowed by 4064 cycles internal processor stabilization delay. The timer is then
cleared and operation resumes.
The CPU clock halts during the WAIT mode, but the timer remains active. If the
interrupts are enabled, the timer interrupt will cause the processor to exit the WAIT
mode.
0
7
0
00
0
000
6543210
CT0
Ct2
Ct1
Ct3
CT4
CT5
CT6
CT7
W
R
CTCR
$0009
reset
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