參數(shù)資料
型號(hào)： ADUC834BS
廠商： ANALOG DEVICES INC
元件分類： 微控制器/微處理器
英文描述： MicroConverter, Dual 16-/24- Bit ADCs with Embedded 62KB FLASH MCU
中文描述： 8-BIT, FLASH, 12.58 MHz, MICROCONTROLLER, PQFP52
封裝： 14 X 14 MM, MO-022-AC-1, MQFP-52
文件頁(yè)數(shù)： 40/72頁(yè)
文件大小： 1451K
代理商： ADUC834BS
(12 March 2002) REV.
P
rC
ADuC834
–
40
–
PRELIMINARY TECHNICAL DATA
E xample: Programming the flash/E E data memory
A user wishes to write F3H into the second byte on Page 03H of
the Flash/EE Data Memory space while preserving the other three
bytes already in this page.
A typical access to the Flash/EE Data array will involve setting
up the page address of the page to be accessed in the EADRH/
L SFRs, configuring the EDAT A1
–
4 SFRs with data to be pro-
grammed to the array (the EDAT A SFRs will not be written for
read accesses) and finally, writing the ECON command word
which initiates one of the nine modes shown in T able X IV.
Step 1: Set up the page address:
T he two address registers EADRH and EADRL hold the high
byte address and the low byte address of the page to be ad-
dressed.
T o set the address up in assembly language would appear as
follows.
MOV EADRH,#0
; Set Page Address Pointer
MOV EADRL,#03H
Step 2: Set up the E DAT A registers:
We must now write the 4 values to be written into the page
into the 4 SFRs EDAT A1-4. Unfortunately we do not know 3
of them. Hence we must read the current page and overwrite
the second byte.
MOV ECON,#1
MOV EDATA2,#0F3H ; Overwrite byte 2
Step 3:Program Page:
A byte in the Flash/EE array can only be programmed if it has
previously been erased. T o be more specific, a byte can only be
programmed 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 four bytes (1 page) will be erased
when an erase command is initiated. Once the page is erased
we can program the 4 bytes in page and then perform a verifi-
cation of the data.
; Read Page into EDATA1-4
MOV ECON,#5
MOV ECON,#2
MOV ECON,#4
MOV A, ECON
JNZ ERROR
; ERASE Page
; WRITE Page
; VERIFY Page
; Check if ECON=0 (OK!)
Note:
As with all Flash/EE memory architectures, the array can be
programmed in-system at a byte level, although it must be
erased first; the erasure being performed in page blocks (4-
byte pages in this case).
Although the 4kBytes of Flash/EE data memory is shipped
from the factory pre-erased, i.e., Byte locations set to FFH, it is
nonetheless good programming practice to include an erase-all
routine as part of any configuration/setup code running on the
ADuC834. An
“
ERASE-ALL
”
command consists of writing
“
06H
”
to the ECON SFR, which initiates an erase of the
4kByte Flash/EE array. T his command coded in 8051 assembly
would appear as:
MOV ECON,#06H
; Erase all Command
; 2 ms Duration
Flash/E E Memory T iming
T ypical program and erase times for the ADuC834 are as fol-
lows:
NORMAL MODE (operating on flash/EE data memory)
READPAGE (4 bytes)
–
instruction time +
3 machine cycles
–
380
μ
s
–
instruction time +
3 machine cycles
–
2ms
–
2ms
–
instruction time +
1 machine cycle
–
200
μ
s
WRIT EPAGE (4 bytes)
VERIFYPAGE (4 bytes)
ERASEPAGE (4 bytes)
ERASEALL (4kBytes)
READBYT E (1 byte)
WRIT EBYT E (1 byte)
ULOAD MODE (operating on flash/EE program memory)
WRIT EPAGE (256 bytes)
ERASEPAGE (64 bytes)
ERASEALL (56kBytes)
READBYT E (1 byte)
–
15ms
–
2 ms
–
2 ms
–
instruction time +
1 machine cycle
–
200
μ
s
WRIT EBYT E (1 byte)
It should be noted that a given mode of operation is initiated as
soon as the command word is written to the ECON SFR. T he
core microcontroller operation on the ADuC834 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 will not be executed until the Flash/EE
operation is complete. T his means that the core will not respond
to Interrupt requests until the Flash/EE operation is com-
plete, although the core peripheral functions like Counter/
T imers will continue to count and time as configured through-
out this period.
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