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參數(shù)資料
| 型號： | ADUC836BCP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MicroConverter, Dual 16-Bit-ADCs with Embedded 62 kB Flash MCU |
| 中文描述： | 8-BIT, FLASH, 12.58 MHz, MICROCONTROLLER, QCC56 |
| 封裝： | 8 X 8 MM, ROHS COMPLIANT, MO-220-VLLD-2, LFCSP-56 |
| 文件頁數(shù)： | 67/80頁 |
| 文件大?。?/td> | 5913K |
| 代理商： | ADUC836BCP |
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ADuC836
–67–
OTHER HARDWARE CONSIDERATIONS
In-Circuit Serial Download Access
Nearly all ADuC836 designs will want to take advantage of the
in-circuit reprogrammability of the chip. This is accomplished
by a connection to the ADuC836’s UART, which requires an
external RS-232 chip for level translation if downloading code
from a PC. Basic configuration of an RS-232 connection is illus-
trated in Figure 66 with a simple ADM3202 based circuit. If users
would rather not include an RS-232 chip onto the target board,
refer to the application note,
uC006–A 4-Wire UART-to-PC Interface
available at
, for a simple (and zero-cost-per-board) method of gaining in-circuit serial download
access to the ADuC836.
In addition to the basic UART connections, users will also need
a way to trigger the chip into Download mode. This is accom-
plished via a 1 k
pull-down resistor that can be jumpered onto
the
PSEN
pin, as shown in Figure 66. To get the ADuC836 into
Download mode, simply connect this jumper and power-cycle the
device (or manually reset the device, if a manual reset button is
available), and it will be ready to receive a new program serially.
With the jumper removed, the device will power on in Normal
mode (and run the program) whenever power is cycled or RESET
is toggled.
Note that
PSEN
is normally an output (as described in the Exter-
nal Memory Interface section) and that it is sampled as an input
only on the falling edge of RESET (i.e., at power-up or upon an
external manual reset). Note also that if any external circuitry
unintentionally pulls
PSEN
low during power-up or reset events,
it could cause the chip to enter Download mode and therefore fail
to begin user code execution as it should. To prevent this, ensure
that no external signals are capable of pulling the
PSEN
pin low,
except for the external
PSEN
jumper itself.
Embedded Serial Port Debugger
From a hardware perspective, entry to Serial Port Debug mode is
identical to the serial download entry sequence described above.
In fact, both Serial Download and Serial Port Debug modes can
be thought of as essentially one mode of operation used in two
different ways.
Note that the serial port debugger is fully contained on the
ADuC836 device, (unlike ROM monitor type debuggers) and
therefore no external memory is needed to enable in-system
debug sessions.
Single-Pin Emulation Mode
Also built into the ADuC836 is a dedicated controller for single-pin
in-circuit emulation (ICE) using standard production ADuC836
devices. In this mode, emulation access is gained by connection to
a single pin, the
EA
pin. Normally, this pin is hard-wired either
high or low to select execution from internal or external program
memory space, as described earlier. To enable single-pin emu-
lation mode, however, users will need to pull the
EA
pin high
through a 1 k
resistor, as shown in Figure 66. The emulator
will then connect to the 2-pin header also shown in Figure 66.
To be compatible with the standard connector that comes
with the single-pin emulator available from Accutron Limited
(www.accutron.com), use a 2-pin 0.1-inch pitch Friction Lock
header from Molex (www.molex.com) such as their part number
22-27-2021. Be sure to observe the polarity of this header. As
represented in Figure 66, when the Friction Lock tab is at the
right, the ground pin should be the lower of the two pins (when
viewed from the top).
REV. A
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| ADUC836BCPZ | 功能描述:IC MCU 62K FLASH ADC/DAC 56LFCSP 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(shù):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(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)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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