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| 型號： | MC68HC05P4ADW |
| 廠商： | FREESCALE SEMICONDUCTOR 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 |
| 文件頁數(shù)： | 38/72頁 |
| 文件大?。?/td> | 400K |
| 代理商： | MC68HC05P4ADW |
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MC68HC05P4A Data Sheet, Rev. 7.1
Freescale Semiconductor
43
Chapter 10
Self-Check Mode
10.1 Introduction
The self-check program resides at mask ROM (read-only memory) locations $1F00 to $1FEF. This
program is designed to check the part’s functionality with a minimum of support hardware. The computer
operating properly (COP) subsystem is disabled in the self-check mode so that routines that feed the COP
do not exist in the self-check program.
10.2 Functional Description
The self-check mode is entered on the rising edge of RESET if the IRQ pin is driven to double the supply
voltage and the TCAP/PD7 pin is at logic 1. RESET must be held low for 4064 cycles after power-on reset
(POR) or for a time, tRL, for any other reset. After reset, the input/output (I/O), random-access memory
(RAM), ROM, timer, simple serial input/output port (SIOP), and interrupts are tested. Self-check results
(using light-emitting diodes (LEDs) as monitors) are shown in Table 10-1. It is not recommended that the
user code use any of the self-check code. The self-check code is subject to change at any time to improve
testability or manufacturability.
Figure 10-1 illustrates a self-check circuit.
Table 10-1. Self-Check Results
PC2
PC1
PC0
Remarks
0
1
Bad I/O
0
1
0
Bad RAM
0
1
Bad timer
1
0
Bad ROM
1
0
1
Bad serial
1
0
Bad interrupt
Flashing
Good device
All others
Bad device
Note:
0 indicates LED is on; 1 indicates LED is off.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC05P4DW | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
| MC68HC05P4P | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
| MC68HC05P6 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
| MC68HC05P6_1 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
| MC68HC05P8 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:HCMOS MICROCONTROLLER UNIT |
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