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| 型号： | MC68HC05SR3CB |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP42 |
| 封装： | SDIP-42 |
| 文件页数： | 71/96页 |
| 文件大小： | 612K |
| 代理商： | MC68HC05SR3CB |
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MC68HC05SR3
MOTOROLA
10-1
OPERATING MODES
10
OPERATING MODES
The MC68HC05SR3/
MC68HC705SR3 has two modes of operation: the User Mode and the
Self-Check/
Bootstrap Mode. Table 10-1 shows the conditions required for entering the two
operating modes.
10.1
User Mode
The normal operating mode of the MC68HC05SR3/
MC68HC705SR3 is the User mode. This
mode is entered on the rising edge of RESET when the VPP and PB1 pins are between VSS and
VDD.
10.2
Self-Check Mode
The Self-check mode is provided on the MC68HC05SR3 for the user to check device functions
with an on-chip self-check program masked at location $1F00 to $1FEF under minimum hardware
support. The self-check schematic is shown in Figure 10-1. Self-check mode is entered on the
rising edge of RESET when the VPP pin is at VTST (2×VDD) and PB1 pin is at VDD. Once in the
self-check mode, PB1 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 10-2 lists the LEDs’
on-off patterns and their corresponding indications.
Table 10-1 Mode Selection
RESET
VPP
PB1
MODE
VSS to VDD
USER
VTST
VDD
SELF-CHECK/
BOOTSTRAP
VTST=2×VDD
5V
TPG
71
相关PDF资料 |
PDF描述 |
|---|---|
| MC68HC05SR3CP | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP40 |
| MC68HC705SR3B | 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PDIP42 |
| MC68HC05SR3FB | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PQFP44 |
| MC68HC05SR3P | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP40 |
| MC68HC705SR3CFB | 8-BIT, OTPROM, 2 MHz, MICROCONTROLLER, PQFP44 |
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|---|---|
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| MC68HC05T16 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit |
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| MC68HC05V12CFN | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:General Release Specification |
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