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dsPICDEM? 1.1 Development Board User’s Guide
? Data Converter Interface - Interfaced to an external Si3000 voice-band Codec for
transmission of DTMF PCM signals
? INTx pins - Used for detecting switch SW1-SW4 inputs
? Hierarchical/Prioritized Interrupt Control with nesting enabled
3.4
DATA AND CONTROL FLOW
3.4.1
Power-up Sequence
The power-up peripheral initialization sequence is shown in Table 3-3.
TABLE 3-3:
POWER-UP PERIPHERAL INITIALIZATION SEQUENCE
Seq
1
2
3
4
5
6
7
8
9
10
11
12
13
Module or Function
Timer1
Timer2
Timer3
Timer4 & Timer5
Interrupt Service
Routine (ISR)
UART2
SPI 2
Data Converter
Interface (DCI)
Si3000
DCI
External interrupt
pins INT1-INT4
12-bit ADC
Interrupts
Initialization Process
Configured to count to 125 μS, but not enabled.
Configured to count to 1 second using a 256:1 prescaler
setting.
Configured to count up to 1.14 seconds using the 256:1
prescaler setting.
Configured to operate in the 32-bit Timer mode, but not
enabled until needed.
Processing is enabled for Timer2 and Timer3.
Both the transmitter and receiver are configured for
interrupt-driven operation at 57600 baud.
Initially configured to operate in an interrupt-driven mode at
F CY /8 Hz (where F CY = 7.3728 MHz). The module communi-
cates at F CY /8 Hz in 8-bit mode while displaying results on the
LCD controller. When it is used to step the MCP41010, it
operates in the 16-bit mode at F CY /32 Hz.
Configured for Master mode. Initially configured to use two of
four buffers. Transmits/receives in time slot 1 at the frame rate
of 7200 Hz for configuring the Si3000 external voice-band
Codec.
Configured for Slave mode. The Si3000 line and speaker
ports are enabled. Signal attenuation is set to 0 dB. The ADC
input from the Si3000 is attenuated by 34.5 dB and is not used
in this demo.
Re-initialized to operate with all four buffers in interrupt-driven
mode for transmitting DTMF PCM words to the Si3000 Codec.
Configured to interrupt on the falling edge and used for
switches SW1-SW4, respectively.
Configured to operate at 8000 Hz sampling rate and generate
an interrupt every 16 sample-convert sequences. The ADC
samples channel AN3 (sinewave), AN4 (RP2), AN5 (RP3),
AN6 (RP1) and AN8 (temperature sensor U9).
Peripheral interrupts are configured. Nested interrupts are
enabled.
DS70099B-page 34
Advance Information
? 2003 Microchip Technology Inc.
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