參數(shù)資料
型號(hào)： ADUC832BCP
廠商： ANALOG DEVICES INC
元件分類： 微控制器/微處理器
英文描述： MicroConverter, 12-Bit ADCs and DACs with Embedded 62 kBytes Flash MCU
中文描述： 8-BIT, FLASH, 16.78 MHz, MICROCONTROLLER, PQFP52
封裝： MO-112AC-1, MQFP-52
文件頁(yè)數(shù)： 65/80頁(yè)
文件大?。?/td> 1311K
代理商： ADUC832BCP
REV. 0
ADuC832
–65–
OTHER HARDWARE CONSIDERATIONS
To facilitate in-circuit programming, plus in-circuit debug and
emulation options, users will want to implement some simple
connection points in their hardware that will allow easy access
to download, debug, and emulation modes.
In-Circuit Serial Download Access
Nearly all ADuC832 designs will want to take advantage of the
in-circuit reprogrammability of the chip. This is accomplished by
a connection to the ADuC832
’
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
illustrated in Figure 64 with a simple ADM202-based circuit.
If users would rather not design an RS-232 chip onto a board,
refer to the application note
“
uC006
–
A 4-Wire UART-to-PC
Interface
”
*
for a simple (and zero-cost-per-board) method of
gaining in-circuit serial download access to the ADuC832.
In addition to the basic UART connections, users will also need a
way to trigger the chip into download mode. This is accomplished
via a 1 k
pull-down resistor that can be jumpered onto the
PSEN
pin, as shown in Figure 64. To get the ADuC832 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 come up 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
External Memory Interface section) and 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.
*
www.analog.com/microconverter
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