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參數資料
| 型號： | ADUC848BS8-5 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MicroConverter Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU |
| 中文描述： | 8-BIT, FLASH, 12.58 MHz, MICROCONTROLLER, PQFP52 |
| 封裝： | 14 X 14 MM, PLASTIC, MO-112-AC-1, MQFP-52 |
| 文件頁數： | 52/108頁 |
| 文件大小： | 1109K |
| 代理商： | ADUC848BS8-5 |
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ADuC845/ADuC847/ADuC848
Example: Programming the Flash/EE Data Memory
A user wants to program F3H into the second byte on Page 03H
of the Flash/EE data memory space while preserving the other
3 bytes already in this page. A typical program of the Flash/EE
data array involves
Rev. A | Page 52 of 108
1.
Setting EADRH/L with the page address.
2.
Writing the data to be programmed to the EDATA1–4.
3.
Writing the ECON SFR with the appropriate command.
Step 1: Set Up the Page Address
Address registers EADRH and EADRL hold the high byte
address and the low byte address of the page to be addressed.
The assembly language to set up the address may appear as
MOV EADRH, #0 ;Set Page Address Pointer
MOV EADRL, #03H
Step 2: Set Up the EDATA Registers
Write the four values to be written into the page into the four
SFRs EDATA1–4. Unfortunately, the user does not know three
of them. Thus, the user must read the current page and overwrite
the second byte.
MOV ECON, #1
;Read Page into EDATA1-4
MOV EDATA2, #0F3H ;Overwrite Byte 2
Step 3: Program Page
A byte in the Flash/EE array can be programmed only if it has
previously been erased. Specifically, a byte can be programmed
only if it already holds the value FFH. Because of the Flash/EE
architecture, this erasure must happen at a page level; therefore,
a minimum of 4 bytes (1 page) are erased when an erase
command is initiated. Once the page is erased, the user can
program the 4 bytes in-page and then perform a verification of
the data.
MOV ECON, #5
MOV ECON, #2
MOV ECON, #4
MOV A, ECON
;ERASE Page
;WRITE Page
;VERIFY Page
;Check if ECON = 0 (OK!)
Although the 4 kbytes of Flash/EE data memory are factory pre-
erased, that is, byte locations set to FFH, it is good programming
practice to include an ERASEALL routine as part of any
configuration/set-up code running on the parts. An ERASEALL
command consists of writing 06H to the ECON SFR, which
initiates an erase of the 4-kbyte Flash/EE array. This command
coded in 8051 assembly language would appear as
MOV ECON, #06H
;ERASE all Command
;2ms duration
FLASH/EE MEMORY TIMING
Typical program and erase times for the parts are as follows:
Normal Mode (Operating on Flash/EE Data Memory)
Command
Bytes Affected
READPAGE
4 bytes
WRITEPAGE
4 bytes
VERIFYPAGE
4 bytes
ERASEPAGE
4 bytes
ERASEALL
4 kbytes
READBYTE
1 byte
WRITEBYTE
1 byte
ULOAD Mode (Operating on Flash/EE Program Memory)
WRITEPAGE
256 bytes
ERASEPAGE
64 bytes
ERASEALL
56 kbytes
WRITEBYTE
1 byte
25 machine cycles
380 μs
25 machine cycles
2 ms
2 ms
10 machine cycles
200 μs
15 ms
2 ms
2 ms
200 μs
Note that a given mode of operation is initiated as soon as the
command word is written to the ECON SFR. The core micro-
controller operation is idled until the requested program/read
or erase mode is completed. In practice, this means that even
though the Flash/EE memory mode of operation is typically
initiated with a two-machine-cycle MOV instruction (to write
to the ECON SFR), the next instruction is not executed until the
Flash/EE operation is complete. This means that the core cannot
respond to interrupt requests until the Flash/EE operation is
complete, although the core peripheral functions such as counter/
timers continue to count as configured throughout this period.
相關PDF資料 |
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| ADUC845 | MicroConverter Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU |
| ADUC845BCP8-3 | MicroConverter Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU |
| ADUC847BCP8-3 | MicroConverter Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU |
| ADUC845BCP8-5 | MicroConverter Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU |
| ADUC847BCP8-5 | MicroConverter Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU |
相關代理商/技術參數 |
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| ADUC848BSZ32-3 | 功能描述:IC MCU FLASH W/16BIT ADC 52MQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標準包裝:38 系列:Encore!® XP® 核心處理器:eZ8 芯體尺寸:8-位 速度:5MHz 連通性:IrDA，UART/USART 外圍設備:欠壓檢測/復位，LED，POR，PWM，WDT 輸入/輸出數:16 程序存儲器容量:4KB（4K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:1K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 3.6 V 數據轉換器:- 振蕩器型:內部 工作溫度:-40°C ~ 105°C 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 包裝:管件 其它名稱:269-4116Z8F0413SH005EG-ND |
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