參數(shù)資料
型號: MC68HC705E6
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數(shù): 45/140頁
文件大?。?/td> 788K
代理商: MC68HC705E6
MC68HC05E6 — Rev. 1.0
Core Timer
Core Timer
Core Timer
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Real time interrupts (RTI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Computer operating properly (COP) watchdog timer . . . . . . . . . . . . .47
Core timer registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Core timer during WAIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Core timer during STOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Introduction
The MC68HC05E6 has a 15-stage ripple counter called the core timer
(CTIMER). Features of this timer are: timer overflow, power-on reset
(POR), real time interrupt (RTI) with four selectable interrupt rates, and
a computer operating properly (COP) watchdog timer.
As shown in
Figure 10
, the timer is driven by the internal bus clock
divided by four with a fixed prescaler. This signal drives an 8-bit ripple
counter. The value of this 8-bit ripple counter can be read by the CPU at
any time, by accessing the CTIMER counter register (CTCR) at address
$09. A timer overflow function is implemented on the last stage of this
counter, giving a possible interrupt at the rate of f
OP
/1024. (The POR
signal (t
PORL
) is also derived from this register, at f
OP
/4064.) The
counter register circuit is followed by four more stages, with the resulting
clock (f
OP
/16384) driving the real time interrupt circuit. The RTI circuit
consists of three divider stages with a 1-of-4 selector. The output of the
RTI circuit is further divided by eight to drive the COP watchdog timer
circuit. The RTI rate selector bits, and the RTI and CTIMER overflow
enable bits and flags, are located in the CTIMER control and status
register (CTCSR) at location $08.
1-ctimer
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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