7630 datasheet(149/238 Pages) RENESAS

149 / 238 page

2-83

7630 Group User’s Manual

APPLICATION

2.5 Serial I/O

Control procedure : Figure 2.5.22 shows a control procedure on the transmitting side, and Figure

2.5.23 shows a control procedure on the receiving side.

Fig. 2.5.22 Control procedure on transmitting side [Communication using UART]

RESET

Initialization

UMOD [Address: 002016]

CPUM [Address: 000016]

00000X002

010X101X2

X : These bits are not used in this application.

Please set these bits to “0” or “1” appropriately.

UCON [Address: 002216]

XXXX01002

•

φ = f(XIN) divided by 2 (high-speed mode)

UBRG [Address: 002116]

4 – 1

UCON [Address: 002216], bit 0

• Transmit enable (Start of communication)

UTBR1 [Address: 002416]

The first byte of transmission data

• Write the first byte of transmission data to the Transmit buffer register.

The Transmit buffer empty flag is cleared to “0” by this writing.

USTS [Address: 002316], bit 1?

• Check whether the data has been transferred from the Transmit buffer

UTBR1 [Address: 002416]

The second byte of transmission data

• Write the second byte of transmission data to the Transmit buffer

to “0” by this writing.

USTS [Address: 002316], bit 0?

• Check the shift completion of the Transmit shift register with the

Transmit shift register shift completion flag.

UCON [Address: 002216], bit 2

• Transmit initialization (End of communication)

The Transmit enable bit is cleared to “0”.

The Transmission register empty flag is set to “1”.

The Transmission buffer empty flag is set to “1”.

When the UCTS input level is “L”,

start transmission (Note).

When the UCTS input level is “L”,

start transmission (Note).

• Transmitting side

• Transfer data format : 1ST-8DATA-2SP

• Transmit initialization

The Transmit enable bit is cleared to “0”.

The Transmission register empty flag is set to “1”.

The Transmission buffer empty flag is set to “1”.

Note: Controlled by the serial I/O logic.

7630 Datasheet(PDF) 149 Page - Renesas Technology Corp

7630 Datasheet(HTML) 149 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL