參數(shù)資料
型號(hào): MC68HC705CT4FB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.048 MHz, MICROCONTROLLER, PQFP44
封裝: QFP-44
文件頁(yè)數(shù): 100/152頁(yè)
文件大?。?/td> 964K
代理商: MC68HC705CT4FB
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Operating Modes
Bootloader Mode
MC68HC705CT4 Rev. 2.0
General Release Specification
MOTOROLA
Operating Modes
51
NON-DISCLOSURE
AGREEMENT
REQUIRED
6.4 Bootloader Mode
Bootloader mode is entered upon the rising edge of RESET if the IRQ is
at VTST and the PB1 pin is at logic one. The bootloader code resides in
the ROM from $1F01 to $1FEF. This program handles copying of user
code from an external EPROM into the on-chip EPROM. The bootload
function does not have to be done from an external EPROM, but it may
be done from a host. (See Section 15. EPROM.)
6.5 Low-Power Modes
The following paragraphs describe the low-power modes.
6.5.1 Stop Mode
The STOP instruction places the MCU in its lowest power-consumption
mode. In stop mode, the internal oscillator is turned off, halting all
internal processing, including timer operation.
During stop mode, the CTCSR ($08) bits are altered to remove any
pending timer interrupt request and to disable any further timer
interrupts. The timer prescaler is cleared. The I bit in the CCR is cleared
to enable external interrupts. All other registers and memory remain
unaltered. All input/output lines remain unchanged. The processor can
be brought out of stop mode only by an external interrupt or reset.
6.5.2 Stop Recovery
The processor can be brought out of the stop mode only by an external
interrupt or RESET. See Figure 6-2.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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