參數(shù)資料
型號(hào): MC68HC705BS8FB
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.2 MHz, MICROCONTROLLER, PQFP44
封裝: QFP-44
文件頁(yè)數(shù): 11/128頁(yè)
文件大?。?/td> 752K
代理商: MC68HC705BS8FB
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MOTOROLA
12-2
MC68HC05BS8
OPERATING MODES
12
12.1
User Mode (Normal Operation)
The normal operating mode of the MC68HC05BS8/
MC68HC705BS8 is the user mode. The user
mode will be entered if the RESET line is brought low, and the IRQ pin is within its normal
operational range (VSS to VDD), the rising edge of the RESET will cause the MCU to enter the user
mode.
12.2
Self-Check Mode
The self-check mode is provided on the MC68HC05BS8 for the user to check device functions with
an on-chip self-check program masked at location $1600 to $17FF under minimum hardware
support. The self-check schematic is shown in Figure 12-3. Figure 12-2 is the criteria to enter
self-check mode, where PB6’s condition is latched within rst two clock cycles after the rising edge
of the reset. PB6 can then be used for other purposes. After entering the self-check mode, CPU
branches to the self-check program and carries out the self-check. Self-check is a repetitive test,
i.e. if all parts are checked to be good, the CPU will repeat the self-check again. Therefore, the
LEDs attached to Port A will be ashing if the device is good; else the combination of LEDs’ on-off
pattern can show what part of the device is suspected to be bad. Table 12-2 lists the LEDs’ on-off
patterns and their corresponding indications.
Table 12-1 Mode Selection
RESET
IRQ
PB6
MODE
VSS to VDD
USER
+9V Rising Edge*
VDD
SELF-CHECK/
BOOTSTRAP
* Minimum hold time should be 2 clock cycles, after that it can be used as a normal IRQ function pin.
Figure 12-2 Self-Check Mode Timing
5V
9V
PB6
IRQ
RESET
+5V
+9V
TPG
106
相關(guān)PDF資料
PDF描述
MC68HC05BS8FB 8-BIT, MROM, 2.2 MHz, MICROCONTROLLER, PQFP44
MC68HC705F4P 8-BIT, OTPROM, 1.789 MHz, MICROCONTROLLER, PDIP28
MC68HC705F4FB 8-BIT, OTPROM, 1.789 MHz, MICROCONTROLLER, PQFP44
MC68HC05F4FB 8-BIT, MROM, 1.789 MHz, MICROCONTROLLER, PQFP44
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