参数资料
型号: MC68HC705CL16
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 1.802 MHz, MICROCONTROLLER, PQFP100
封装: TQFP-100
文件页数: 112/145页
文件大小: 673K
代理商: MC68HC705CL16
June 11, 1997
GENERAL RELEASE SPECIFICATION
MC68HC05CL48
TIMER
MOTOROLA
REV 2.0
8-17
when the output of the chosen (1 of 4 selection) stage goes active.
1 =
No effect
0 =
Clearing the RTIF
CTOFE - Core Timer Overow Enable
When this bit is set, a CPU interrupt request is generated when the TOF bit is
set, provided the I bit in CCR is cleared.
1 =
Interrupt enable
0 =
Interrupt disable
RTIE - Real Time Interrupt Enable
When this bit is set, a CPU interrupt request is generated when the RTIF bit is
set, provided the I bit in the CCR is cleared.
1 =
Interrupt enable
0 =
Interrupt disable
RT1:RT0 - Rate Select
These two bits select one of four taps from the Real Time Interrupt circuit. The
settings for RTI is listed in Table 8-1. Reset sets these RT0 and RT1, selecting
the lowest periodic rate and therefore the maximum time in which to alter these
bits if necessary.
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
current 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
including 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.
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