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参数资料
型号： ADUC845BCPZ8-3
厂商： ANALOG DEVICES INC
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 12.58 MHz, MICROCONTROLLER, QCC56
封装： 8 X 8 MM, LEAD FREE, MO-220-VLLD-2, LFCSP-56
文件页数： 53/108页
文件大小： 1940K
代理商： ADUC845BCPZ8-3
ADuC845/ADuC847/ADuC848
Rev. B | Page 49 of 108
40
60
70
90
TJ JUNCTION TEMPERATURE (°C)
RE
TE
NTION
(Years)
250
200
150
100
50
0
50
80
110
300
100
ADI SPECIFICATION
100 YEARS MIN.
AT TJ = 55°C
04741-028
Figure 27. Flash/EE Memory Data Retention
LASH/EE PROGRAM MEMORY
yte array of
gram
rogram
vaila
NV da
2 kbyte
contain permanen
serial download, s
emulation. These 2 kbytes of embedded firmware also contain
er-on config
tine that downloads factory cali-
ficient
as ADC, tempera
references.
These 2 kbytes of
are hidden from the user
o
ded firmware app
r code.
ati
ro
block is used to st
F
The ADuC845/ADuC847/ADuC848 contain a 64-kb
Flash/EE pro
memory are a
memory. The lower 62 kbytes of this p
ble to the user for program storage or as
ta memory.
additional
The upper
s of this Flash/EE program memory array
tly embedded firmware, allowing in-circuit
erial debug, and nonintrusive single-pin
a pow
uration rou
brated coef
s to the various calibrated peripherals such
ture sensor, current sources, band gap, and
embedded firmware
code. Attempts t read this space read 0s; therefore, the embed-
ears as NOP instructions to use
In normal oper
ng mode (power-on default), the 62 kbytes of
user Flash/EE p gram memory appear as a single block. This
ore the user code as shown in Figure 28.
EMBEDD
PERMANENT
ED
LY
CODE TO BE D
OF
EL
INSTRU
62 kBYTES OF FLASH/EE PROGRAM MEMORY
ARE AVAILABLE TO THE USER. ALL OF THIS
SPACE CAN BE PROGRAMMED FROM THE
PERMANENTLY EMBEDDED DOWNLOAD/DEBUG
KERNEL OR IN PARALLEL PROGRAMMING MODE
DOWNLOAD/DEBUG KERNEL
EMBEDDED FIRMWARE ALLOWS
OWNLOADED TO ANY OF THE
62 kBYTES
THE KERN
ON-CHIP PROGRAM MEMORY.
PROGRAM APPEARS AS NOP
CTIONS TO USER CODE.
.
USER PROGRAM MEMORY
FFFFH
F7FFH
62kBYTE
0000H
2kBYTE
F800H
04741-029
Figure 28. Flash/EE Program Memory Map in Normal Mode
In normal mode, the 62 kbytes of Flash/EE program memory
can be programmed by serial downloading and by parallel
programming.
Serial
The ADuC845/ADuC847/ADuC848 facilitate code download
via the standard UART serial port. The parts enter serial down-
load mode after a reset or a power cycle if the PSEN
Downloading (In-Circuit Programming)
pin is pulled
low through an external 1 k resistor. Once in serial download
mode, the hidden embedded download kernel executes. This
allows the user to download code to the full 62 kbytes of Flash/EE
program memory while the device is in circuit in its target
application hardware.
A PC serial download executable (WSD.EXE) is provided as
part of the ADuC845/ADuC847/ADuC848 Quick Start
development system. Application Note uC004 fully describes
the serial download protocol that is used by the embedded
download kernel. This application note is available at
www.analog.com/microconverter.
Parallel Programming
The
de is fully compatible with
conv
ty flash or EEPROM device programmers.
A b
required to
supp
mo
terface, and P1.0 operates
as t
gen
ation ports that configure the device for various
pro
rase operations during parallel programming.
parallel programming mo
entional third-par
lock diagram of the external pin configuration
ort parallel programming is shown in Figure 29. In this
de, Ports 0 and 2 operate as the external address bus interface,
operates as the external data bus in
P3
he write enable strobe. P1.1, P1.2, P1.3, and P1.4 are used as
eral configur
gram and e
P1.4–P1.1
P3.7–P3.0
EA
RESET
ADuC
+5V
845/
ADuC847/
ADuC848
COMMAND
P1.7–P1.5
TIMING
DATA
04741-030
GND
VDD
ENABLE
P1.0
The co
P1.
Tab
Figure 29. Flash/EE Memory Parallel Programming
mmand words that are assigned to P1.1, P1.2, P1.3, and
4 are described in Table 31.
le 31. Flash/EE Memory Parallel Programming Modes
Port 1 Pins
P1.4
P1.3
P1.2
P1.1
Programming Mode
0
Erase Flash/EE Program, Data, and
Security Mode
1
0
1
0
Program Code Byte
0
1
0
Program Data Byte
1
0
1
Read Code Byte
0
1
Read Data Byte
1
0
Program Security Modes
1
0
1
Read/Verify Security Modes
All other codes
Redundant
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相关代理商/技术参数
参数描述
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