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参数资料
| 型号： | ADUC834BSZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 25/80页 |
| 文件大小： | 0K |
| 描述： | IC ADC DUAL16/24BIT W/MCU 52MQFP |
| 产品培训模块： | Process Control |
| 标准包装： | 1 |
| 系列： | MicroConverter® ADuC8xx |
| 核心处理器： | 8052 |
| 芯体尺寸： | 8-位 |
| 速度： | 12.58MHz |
| 连通性： | EBI/EMI，I²C，SPI，UART/USART |
| 外围设备： | POR，PSM，PWM，温度传感器，WDT |
| 输入/输出数： | 34 |
| 程序存储器容量： | 62KB（62K x 8） |
| 程序存储器类型： | 闪存 |
| EEPROM 大小： | 4K x 8 |
| RAM 容量： | 2.25K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.7 V ~ 5.25 V |
| 数据转换器： | A/D 3x16b，4x24b; D/A 1x12b |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 52-QFP |
| 包装： | 托盘 |
| 产品目录页面： | 738 (CN2011-ZH PDF) |
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REV. A
ADuC834
–31–
Alternatively ULOAD Mode can be used to save data to the
56 Kbytes of Flash/EE memory. This can be extremely useful in
datalogging applications where the ADuC834 can provide up to
60 Kbytes of NV data memory on-chip (4 Kbytes of dedicated
Flash/EE data memory also exist).
The upper 6 Kbytes of the 62 Kbytes of Flash/EE program
memory is only programmable via serial download or parallel
programming. This means that this space appears as read only
to user code. Therefore, it cannot be accidently erased or repro-
grammed by erroneous code execution. This makes it very
suitable to use the 6 Kbytes as a bootloader. A Bootload Enable
option exists in the serial downloader to “Always RUN from
E000h after Reset.” If using a bootloader, this option is recom-
mended to ensure that the bootloader always executes correct
code after reset.
Programming the Flash/EE program memory via ULOAD
mode is described in more detail in the description of ECON
and also in Application Note uC007.
FFFFH
E000H
DFFFH
0000H
USER BOOTLOADER SPACE
THE USER BOOTLOADER SPACE
CAN BE PROGRAMMED IN
DOWNLOAD/DEBUG MODE VIA THE
KERNEL BUT IS READ ONLY WHEN
EXECUTING USER CODE
6 KBYTE
F800H
F7FFH
USER DOWNLOAD SPACE
EITHER THE DOWNLOAD/DEBUG KERNEL
OR USER CODE (IN ULOAD MODE) CAN
PROGRAM THIS SPACE.
EMBEDDED DOWNLOAD/DEBUG KERNEL
PERMANENTLY 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.
56 KBYTE
2 KBYTE
62 KBYTES
OF USER
CODE
MEMORY
Figure 19. Flash/EE Program Memory Map in
ULOAD Mode
Flash/EE Program Memory Security
The ADuC834 facilitates three modes of Flash/EE program
memory security. These modes can be independently activated,
restricting access to the internal code space. These security
modes can be enabled as part of serial download protocol, as
described in Application Note uC004, or via parallel program-
ming. The ADuC834 offers the following security modes:
Lock Mode
This mode locks the code memory, disabling parallel program-
ming of the program memory. However, reading the memory in
Parallel Mode and reading the memory via a MOVC command
from external memory are still allowed. This mode is deactivated
by initiating an “erase code and data” command in Serial Down-
load or Parallel Programming modes.
Secure Mode
This mode locks the code memory, disabling parallel program-
ming of the program memory. Reading/Verifying the memory in
Parallel Mode and reading the internal memory via a MOVC
command from external memory is also disabled. This mode is
deactivated by initiating an “erase code and data” command in
Serial Download or Parallel Programming Modes.
Serial Safe Mode
This mode disables serial download capability on the device. If
Serial Safe mode is activated and an attempt is made to reset
the part into Serial Download mode, i.e., RESET asserted and
deasserted with
PSEN low, the part will interpret the serial
download reset as a normal reset only. It will therefore not enter
Serial Download mode, but only execute a normal reset sequence.
Serial Safe mode can only be disabled by initiating an “erase
code and data” command in parallel programming mode.
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