参数资料
| 型号： | DM163012 |
| 厂商： | Microchip Technology |
| 文件页数： | 42/44页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO PICDEM FOR 16C781/782 |
| 标准包装： | 1 |
| 相关产品： | PIC16C781-I/P-ND - IC MCU OTP 1KX14 W/AD COMP 20DIP PIC16C782-I/P-ND - IC MCU CMOS 8BIT 2K 20MHZ 20-DIP PIC16C781/JW-ND - IC MCU OTP 1KX14 W/AD COMP20CDIP PIC16C782/JW-ND - IC MCU EPROM 2KX14 COMP 20CDIP |
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PICDEM ? MSC1 User ’ s Guide
A 40-pin header between the PIC16C782 and the prototype area is intended
for jumpering prototype circuitry to the PIC16C782 or expanding the prototype
area by plugging a pre-made circuit onto the evaluation board. The V DD and
AV DD jumpers connect the on-board linear regulators to the PIC16C782 cir-
cuit and prototype areas. Removal of these jumpers allows for supply volt-
ages and capacity other than that provided by the on-board five volt
regulators. The RS-232 interface is two lines, asynchronous without hand-
shaking. Connection to the PC is via a 9-pin subminiature D connector, wired
for a standard 9-conductor serial port cable.
Note:
The A VDD and V DD jumpers must be in place as shown when the
internal supply is the primary power source.
EVALUATION BOARD FIRMWARE
The Evaluation Board firmware is a simple monitor program that provides
read access to any of the PIC16C781/782 Special Function and memory data
registers or program locations. The firmware also provides write access to
any of the Special Function and data registers. The RS-232 interface is "bit-
banged," since the PIC16C781/782 does not contain a USART peripheral.
Immediately after a RESET, the firmware enters a Search mode for baud rate
calibration. The first character must be a ten-bit serial sequence composed of:
? Start bit (zero)
? Seven consecutive data zeros
? A one data bit
? A stop bit (one).
This is equivalent to sending a H ’ 80 ’ character from a serial port set up for:
? Eight data bits
? One start bit
? One stop bit
? No parity.
You can communicate with the PICDEM ? MSC1 Evaluation Board directly
from a PC with a hyperterminal window setup as just described with a baud
rate of 9600 or less, and local echo turned off. Immediately after the Evalua-
tion Board Reset, send the calibration character from the hyperterminal win-
dow by typing <Alt>(0128). In other words, hold down the <Alt> key down
while typing the four Key Pad numbers 0, 1, 2, 8 in sequence, then release
the <Alt> key. The Num Lock function must be enabled and the Key Pad num-
bers must be used instead of the number keys at the top of the keyboard.
Confirm proper calibration by typing the <Enter> key. The Evaluation Board
will respond with the ’ > ’ character. All characters are echoed by the Evaluation
Board firmware. Only those sequences corresponding to an actual command
will be processed. See the MONITOR.ASM file for details about the command
protocol. Baud rate recalibration can be remotely requested by sending a
break character that is at least three times the character time of the most
recent calibration.
A Break can be sent from the Hyperterminal by typing <CTRL><BREAK>
together.
DS41178A-page 38
? 2001 Microchip Technology Inc.
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