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參數資料
| 型號： | ADUC845 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | ADC |
| 英文描述： | MicroConverter Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU |
| 中文描述： | MicroConverter的多通道ADC的24-/16-Bit與嵌入式62 kB閃存以及單周期控制器 |
| 文件頁數： | 49/108頁 |
| 文件大?。?/td> | 1109K |
| 代理商： | ADUC845 |
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ADuC845/ADuC847/ADuC848
Rev. A | Page 49 of 108
40
60
70
90
T
J
JUNCTION TEMPERATURE (
°
C)
R
250
200
150
100
50
0
50
80
110
300
100
ADI SPECIFICATION
100 YEARS MIN.
AT T
J
= 55
°
C
0
Figure 27. Flash/EE Memory Data Retention
FLASH/EE PROGRAM MEMORY
The ADuC845/ADuC847/ADuC848 contain a 64-kbyte array of
Flash/EE program memory. The lower 62 kbytes of this program
memory are available to the user for program storage or as
additional NV data memory.
The upper 2 kbytes of this Flash/EE program memory array
contain permanently embedded firmware, allowing in-circuit
serial download, serial debug, and nonintrusive single-pin
emulation. These 2 kbytes of embedded firmware also contain a
power-on configuration routine that downloads factory
calibrated coefficients to the various calibrated peripherals such
as ADC, temperature sensor, current sources, band gap, and
references.
These 2 kbytes of embedded firmware are hidden from the user
code. Attempts to read this space read 0s; therefore, the embedded
firmware appears as NOP instructions to user code.
In normal operating mode (power-on default), the 62 kbytes of
user Flash/EE program memory appear as a single block. This
EMBEDDED DOWNLOAD/DEBUG KERNELPERMANENTLY EMBEDDED FIRMWARE ALLOWS
CODE TO BE DOWNLOADED TO ANY OF THE
62 kBYTES OF ON-CHIP PROGRAM MEMORY.
THE KERNEL PROGRAM APPEARS AS NOP
INSTRUCTIONS TO USER CODE.
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.
USER PROGRAM MEMORY
FFFFH
2kBYTE
F800H
F7FFH
62kBYTE
0000H
0
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 Downloading (In-Circuit Programming)
The ADuC845/ADuC847/ADuC848 facilitates 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 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 parallel programming mode is fully compatible with
conventional third-party flash or EEPROM device programmers.
A block diagram of the external pin configuration required to
support parallel programming is shown in Figure 29. In this
mode, Ports 0 and 2 operate as the external address bus interface,
P3 operates as the external data bus interface, and P1.0 operates
as the write enable strobe. P1.1, P1.2, P1.3, and P1.4 are used as
general configuration ports that configures the device for
various program and erase operations during parallel
programming.
P1.4–P1.1
P3.7–P3.0
EA
RESET
ADuC845/
ADuC847/
ADuC848
+5V
COMMAND
P1.7–P1.5
TIMING
DATA
0
ENABLE
GND
V
DD
P1.0
Figure 29. Flash/EE Memory Parallel Programming
The command words that are assigned to P1.1, P1.2, P1.3, and
P1.4 are described in Table 31.
Table 31. Flash/EE Memory Parallel Programming Modes
Port 1 Pins
P1.4
P1.3
P1.2
P1.1
Programming Mode
0
0
0
0
Erase Flash/EE Program, Data, and
Security Mode
1
0
1
0
Program Code Byte
0
0
1
0
Program Data Byte
1
0
1
1
Read Code Byte
0
0
1
1
Read Data Byte
1
1
0
0
Program Security Modes
1
1
0
1
Read/Verify Security Modes
All other codes
Redundant
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