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參數(shù)資料
| 型號： | MC68HC05E16CFB |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16256 bytes of user ROM, 320bytes of EPROM and 352 bytes of RAM |
| 中文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | QFP-44 |
| 文件頁數(shù)： | 87/96頁 |
| 文件大小： | 3045K |
| 代理商： | MC68HC05E16CFB |
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Freescale
A-2
MC68HC05SR3
MC68HC705SR3
A
A.2
Modes of Operation
The MC68HC705SR3 has two modes of operation – user mode and EPROM bootstrap mode.
Table A-1 shows the conditions required to enter each mode on the rising edge of RESET.
A.3
User Mode
The normal operating mode of the MC68HC705SR3 is the user mode. User mode will be entered
on the rising edge of RESET when the VPP and PB1 pins are between VSS and VDD.
Warning: In the MC68HC705SR3, all vectors are fetched from EPROM in user mode; therefore,
the EPROM must be programmed (via the bootstrap mode) before the device is
powered up in user mode.
A.4
Bootstrap Mode
The bootstrap mode is provided as a mean of self-programming MC68HC705SR3 EPROM with
minimal circuitry, and can only run in the crystal oscillator mode. Bootstrap mode will be 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 bootstrap mode, PB1 can then be used for other purposes. After entering the bootstrap
mode, CPU branches to the bootstrap program and carries out the EPROM programming routine.
The user EPROM consists of 3840 bytes, from location $1000 to $1EFF.
This program handles copying of user code from an external EPROM into the on-chip EPROM.
The bootstrap function does not have to be done from an external EPROM, but it may be done
from a host.
The user code must be a one-to-one correspondence with the internal EPROM addresses.
Table A-1 MC68HC705SR3 Operating Mode Entry Conditions
RESET
VPP
PB1
MODE
VSS to VDD
USER
VTST
VDD
BOOTSTRAP
VTST=2×VDD
5V
TPG
86
05SR3.Book Page 2 Thursday, August 4, 2005 1:08 PM
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| MC68HC05E16CFU | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:16256 bytes of user ROM, 320bytes of EPROM and 352 bytes of RAM |
| MC68HC05E16FB | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:16256 bytes of user ROM, 320bytes of EPROM and 352 bytes of RAM |
| MC68HC05E16FU | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:16256 bytes of user ROM, 320bytes of EPROM and 352 bytes of RAM |
| MC68HC05E5 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:General Release Specification |
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