參數(shù)資料
型號: MC68HC08KH12A
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Microcontrollers
中文描述: 微控制器
文件頁數(shù): 58/178頁
文件大?。?/td> 925K
代理商: MC68HC08KH12A
System Integration Module (SIM)
MC68HC08KH12A Data Sheet, Rev. 1.1
58
Freescale Semiconductor
Figure 7-16
and
Figure 7-17
show the timing for WAIT recovery.
Figure 7-16. Wait Recovery from Interrupt or Break
Figure 7-17. Wait Recovery from Internal Reset
7.6.2 Stop Mode
In stop mode, the SIM counter is reset and the system clocks are disabled. An interrupt request from a
module can cause an exit from stop mode. Stacking for interrupts begins after the selected stop recovery
time has elapsed. Reset or break also causes an exit from stop mode.
The SIM disables the oscillator signals (CGMOUT and CGMXCLK) in stop mode, stopping the CPU and
peripherals. Stop recovery time is selectable using the SSREC bit in the configuration register (CONFIG).
If SSREC is set, stop recovery is reduced from the normal delay of 4096 CGMXCLK cycles down to 32.
This is ideal for applications using canned oscillators that do not require long startup times from stop
mode.
NOTE
External crystal applications should use the full stop recovery time by
clearing the SSREC bit.
A break interrupt during stop mode sets the SIM break stop/wait bit (SBSW) in the break status register
(BSR).
The SIM counter is held in reset from the execution of the STOP instruction until the beginning of stop
recovery. It is then used to time the recovery period.
Figure 7-18
shows stop mode entry timing.
NOTE
To minimize stop current, all pins configured as inputs should be driven to
a logic 1 or logic 0.
$6E0C
$6E0B
$00FF
$00FE
$00FD
$00FC
$A6
$A6
$01
$0B
$6E
$A6
IAB
IDB
EXITSTOPWAIT
NOTE: EXITSTOPWAIT = RST pin OR CPU interrupt OR break interrupt
IAB
IDB
RST
$A6
$A6
$6E0B
RSTVCTH
RSTVCTL
$A6
KCGMXCLK
32
Cycles
32
Cycles
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