Wavecom GR64 UART Sleep Protocols Especificaciones descargar pdf (Pagina 59)

5.5. SOFTWARE

Peripheral Function

CCP1 Generate interrupt on every fourth e dge

Timer0 Implement timeout (20ms)

Timer3

Elapsed time between CCP interrupts

(coupled to CCP module)

Table 5.5: Microprocessor peripheral allocations during capture

an interrupt on every fourth rising edge. When this occurs, the CCP ISR

stores the value in Timer3’s counter in an array for later processing. Timer3

is then reset in order to time the period to the next fourth edge. The following

section of pseudo code illustrates this operation:

Preset Timer0 (20ms)

while (Timer0 has not overflowed) and (receive buffer not full)

Wait for CCP interrupt

{

Capture value in Timer3 register on every fourth edge

Reset Timer3 after every fourth edge

}

Timer3 is initialised with a prescaler of 4 from the bus frequency of

8MHz

. Recall that the two expected received frequencies are 123.4kHz and

134.2kHz. The frequencies of the interrupts are thus expected to be 30.85kHz

and 33.55kHz respectively (after the hardware divide by four). The values in

the stored array for each channel are thus expected to increment in values of

57 (2M Hz÷30.85k Hz) or 65 (2MHz÷33.55kHz) depending on the received

frequency. In this way the bit stream can be de termined during the decode

stage.

When the buﬀer is ﬁlled, or Timer0 overﬂows, decoding is started.

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 140 141

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Yamaha CDC-845 Uživatelský manuál (24 strany)

Značka: Yamaha | Kategorie: CD players | Velikost: 0.38 MB |

Tabulka s obsahem

CDC-845 / 745

SAFETY INSTRUCTIONS

FCC INFORMATION

CONNECTIONS

IDENTIFICATION OF COMPONENTS

REMOTE CONTROL TRANSMITTER

FRONT PANEL

To stop play temporarily

To stop play completely

To advance rapidly

To reverse rapidly

Selecting time displays

OUTPUT LEVEL

CDC-845 CDC-745

To stop program play

To check programmed data

To correct programmed data

PROGRAM FILING

To play with program data

REPEAT PLAY

INDEX SEARCH

■ Automatic tape programming

■ Manual tape programming

DISC SKIP

To play a 3-inch (8-cm) CD

Battery installation

Battery replacement

TROUBLESHOOTING

SPECIFICATIONS

VR 20240

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