参数资料
型号: DM300004-2
厂商: Microchip Technology
文件页数: 50/114页
文件大小: 0K
描述: BOARD DEMO DSPICDEM.NET 2
标准包装: 1
系列: dsPIC™
类型: 微控制器
适用于相关产品: CTR-21 PSTN,以太网 NIC
所含物品: 板,线缆,CD,电源
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PICDEM.net? 1 and dsPICDEM.net 2 Connectivity Dev Board User’s Guide
? Data Converter Interface – Interfaced to an external Si303x DAA/AFE chipset for
PSTN interface control and monitor.
? INTx pins – Used for detecting switch S1-S3 inputs.
? PORTD pins, RD0-RD15 – Used to interface to 64Kx16 SRAM, 10-base T NIC
and 2x16 LCD.
3.9
DATA AND CONTROL FLOW
3.9.1
Power-up Sequence
Table 3-1 provides more details on the power-up peripheral initialization sequence
illustrated in Figure 3-17.
TABLE 3-1:
POWER-UP PERIPHERAL INITIALIZATION SEQUENCE
Seq
1
2
3
4
5
6
7
8
9
10
11
Module or Board
Function
Timer1
Timer2
Timer3
2x16 LCD
64Kx16 SRAM
10-base T NIC
UART1
Data Converter
Interface (DCI)
External interrupt
pins INT1-INT3
SPI? 1
12-bit ADC
Initialization Process
Configured to count to 2.2 mS and reset.
Configured to count to 3.95 mS and reset.
Configured to count to 2.2 mS and reset.
Initialization of 2x16 character LCD, via PORTD pins
RD0-RD15.
Initialization and test of 64Kx16 SRAM, via PORTD pins
RD0-RD15. Testing is performed by writing and reading back
a specific incrementing pattern.
Initialization and test of 10-base T NIC, via PORTD pins
RD0-RD15. Testing is performed by performing internal
loop-back tests as supported by the NIC.
The transmitter is configured for interrupt-driven operation at
38400 baud.
Configured for Slave mode. Configured to communicate to the
Si303x DAA/AFE chipset operating in Master mode. Some
DAA/AFE self test routines are executed.
Configured to interrupt on the falling edge and used for
switches S1-S3, respectively.
Configured for communication with MCP42050 Dual Channel
Digital potentiometer.
Configured to continuously sample channels AN3
(temperature sensor U2), AN4 (RP1) and AN5 (RP2).
3.9.2
Main Loop Code Execution
Table 3-2 explains the step-by-step execution sequence of the Main Loop shown in
TABLE 3-2:
Seq.
MAIN LOOP CODE EXECUTION SEQUENCE
Program Task
DS51471A-page 46
1
2
3
4
5
Check state of variable “hook_status”, which is modified in either INT1, INT2 and
INT3 Interrupt Service Routines.
12-bit ADC collects a sample each from the digital potentiometer RP1 and RP2 and
temperature sensor, U2.
Data obtained from ADC is converted to ASCII for display by UART and LCD.
LCD is updated with Potentiometer RP1 and RP2 values.
SPI 1 transmit RP1 and RP2 values to dual channel digital potentiometer. Monitor of
potentiometer output is via PW0 and PW1 test points on board.
? 2004 Microchip Technology Inc.
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