參數(shù)資料
型號(hào): S908QC16CDRER
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO28
封裝: 4.40 MM, 1.20 MM HEIGHT, 0.65 MM PITCH, LEAD FREE, MO-153AE, TSSOP-28
文件頁(yè)數(shù): 73/274頁(yè)
文件大?。?/td> 3183K
代理商: S908QC16CDRER
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System Integration Module (SIM)
MC68HC908QC16 MC68HC908QC8 MC68HC908QC4 Data Sheet, Rev. 5
164
Freescale Semiconductor
14.6.4 Break Interrupts
The break module can stop normal program flow at a software programmable break point by asserting its
break interrupt output. (See Chapter 18 Development Support.) The SIM puts the CPU into the break
state by forcing it to the SWI vector location. Refer to the break interrupt subsection of each module to
see how each module is affected by the break state.
14.6.5 Status Flag Protection in Break Mode
The SIM controls whether status flags contained in other modules can be cleared during break mode. The
user can select whether flags are protected from being cleared by properly initializing the break clear flag
enable bit (BCFE) in the break flag control register (BFCR).
Protecting flags in break mode ensures that set flags will not be cleared while in break mode. This
protection allows registers to be freely read and written during break mode without losing status flag
information.
Setting the BCFE bit enables the clearing mechanisms. Once cleared in break mode, a flag remains
cleared even when break mode is exited. Status flags with a two-step clearing mechanism — for example,
a read of one register followed by the read or write of another — are protected, even when the first step
is accomplished prior to entering break mode. Upon leaving break mode, execution of the second step
will clear the flag as normal.
14.7 Low-Power Modes
Executing the WAIT or STOP instruction puts the MCU in a low power- consumption mode for standby
situations. The SIM holds the CPU in a non-clocked state. The operation of each of these modes is
described below. Both STOP and WAIT clear the interrupt mask (I) in the condition code register, allowing
interrupts to occur.
14.7.1 Wait Mode
In wait mode, the CPU clocks are inactive while the peripheral clocks continue to run. Figure 14-14 shows
the timing for wait mode entry.
Figure 14-14. Wait Mode Entry Timing
A module that is active during wait mode can wake up the CPU with an interrupt if the interrupt is enabled.
Stacking for the interrupt begins one cycle after the WAIT instruction during which the interrupt occurred.
In wait mode, the CPU clocks are inactive. Refer to the wait mode subsection of each module to see if
the module is active or inactive in wait mode. Some modules can be programmed to be active in wait
mode.
WAIT ADDR + 1
SAME
ADDRESS BUS
DATA BUS
PREVIOUS DATA
NEXT OPCODE
SAME
WAIT ADDR
SAME
R/W
NOTE: Previous data can be operand data or the WAIT opcode, depending on the last instruction.
相關(guān)PDF資料
PDF描述
MC908QC16CDRE 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO28
MC908QC16CDTE 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16
S912XDP512F0VPV 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP112
MC312XDP512J1MPVR 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP112
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
S908QC16CDSE 制造商:Freescale Semiconductor 功能描述:MCU 8BIT HC08 CISC 16KB FLASH 3.3V/5V 20TSSOP - Bulk
S908QC16CDSER 制造商:Freescale Semiconductor 功能描述:MCU 8BIT HC08 CISC 16KB FLASH 3.3V/5V 20TSSOP - Tape and Reel
S908QC16CDTE 制造商:Freescale Semiconductor 功能描述: 制造商:Freescale Semiconductor 功能描述:MCU 8BIT HC08 CISC 16KB FLASH 3.3V/5V 16TSSOP - Bulk
S908QC16CDTER 制造商:Freescale Semiconductor 功能描述:MCU 8BIT HC08 CISC 16KB FLASH 3.3V/5V 16TSSOP - Tape and Reel
S908QC16CDXER 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Microcontrollers