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參數(shù)資料
| 型號(hào)： | MC68HC05E1DWR3 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁(yè)數(shù)： | 18/86頁(yè) |
| 文件大?。?/td> | 491K |
| 代理商： | MC68HC05E1DWR3 |
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Operating Modes
Self-Check Mode
MC68HC05E1 — Revision 2.0
General Release Specication
MOTOROLA
Operating Modes
25
2.4.3 Additional Self-Check Routines
The Self-Check ROM contains additional programs to facilitate testing
and characterization of the device. Figure 2-3 shows the program flow
in the Self-Check ROM. These programs are used in Self-Check Mode
(PB1=1). On power-up, the device goes into Self-Check Mode on the
rising edge of RESET if the IRQ pin is at VTST, and the PB1 pin is at logic
one. The values of PB0:PB3 after power-up determine which routine is
executed from the Self-Check ROM. Only the Self-Check routine is
intended for customer use.
Figure 2-3. Self-Check Mode Flowchart
Table 2-2. Self-Check Results
PA3
PA2
PA1
PA0
Remarks
1001
Bad I/O
1010
Bad RAM
1011
Bad Timer
1100
Bad ROM
1101
Bad Interrupts or IRQ request
Flashing
Good Device
All Others
Bad Device
0 indicates LED is on; 1 indicates LED is off.
JUMP TO RAM
LOAD RAM
NO
YES
NO
SELF-CHECK
& EXECUTE
PB3=1?
NO
YES
PLL
DISABLED
PLL
ENABLED
PB0=1?
PB2=1?
POWER-UP
IRQ = VTST
PB1=1
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