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參數資料
| 型號： | MC68HC805K3 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數： | 3/56頁 |
| 文件大小： | 311K |
| 代理商： | MC68HC805K3 |
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Application Note
Alternate Solutions
AN1288
MOTOROLA
3
Alternate Solutions
As mentioned earlier, the design of the MC68HC(8)05K3’s PEEPROM
prevents the MMDS/MMEVS development systems from providing
users with direct access to this peripheral. Unlike with emulator pseudo-
RAM or on-chip EEPROM, users cannot modify or read the contents of
the PEEPROM with instructions from the MMDS/MMEVS command
line. Two features of the PEEPROM’s design in particular prevent the
MMDS and MMEVS systems from gaining access to the PEEPROM.
The first feature is that the PEEPROM data can be accessed only one
bit at a time through the manipulation of on-chip registers by software
stored in user memory space. Secondly, the PEEPROM is not a part of
the MC68HC(8)05K3’s memory map. This requires that alternative
methods be found to provide users with access to this peripheral during
the development process. Before considering the design and
implementation of K3EEPROG, two alternate methods of accessing the
PEEPROM will be discussed in this application note.
The simplest method of accessing the PEEPROM on an MMDS’s or
MMEVS’s resident MC68HC(8)05K3 is to remove the MCU from the
M68EM05K3 emulator board, program or read the PEEPROM with the
programmer provided for the MC68HC(8)05K3, and reinstall it on the
M68EM05K3.
When a developer wants to read or program the PEEPROM more
frequently, small assembly code routines can be written and kept for use
whenever the PEEPROM is to be accessed. When the PEEPROM is to
be programmed, the user can fill a designated section of the
MMDS/MMEVS’s memory with the data to be programmed into the
PEEPROM. The assembly code module designed to program the
PEEPROM then can be loaded and executed from the MMDS/MMEVS
command line. The software then can read the user-entered data from
the emulator’s memory and program the PEEPROM with it. The same
process can be used to read the contents of the PEEPROM, except
instead of reading data from the designated memory, the assembly code
module writes the contents of the PEEPROM into a designated area of
the emulator’s memory where it can be read by the user. This method
can be automated by utilizing the MMDS/MMEVS’s scripting feature.
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| MC68HC908AB32MFU | 制造商:Rochester Electronics LLC 功能描述:32K FLASH & 512 EE - Bulk |
| MC68HC908AB32MPB | 功能描述:IC MCU 32K FLASH 8MHZ 64-LQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:HC08 標準包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設備:POR，PWM，溫度傳感器，WDT 輸入/輸出數:21 程序存儲器容量:40KB（20K x 16） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數據轉換器:A/D 6x12b 振蕩器型:內部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
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