7480 datasheet(130/337 Pages) RENESAS

130 / 337 page

7480 Group and 7481 Group User's Manual

1-113

1.14 Serial I/O

HARDWARE

(5)

Baud Rate Generator (BRG)

The baud rate generator is an 8-bit counter with an auto-reload register, used only for serial I/O.

When the serial I/O synchronous clock selection bit of the serial I/O control register is ‘0’, setting

value ‘n’ (any number of 0016 to FF16) to the baud rate generator outputs a signal of the BRG count

source (Note 1) divided by ‘n + 1’ as the BRG output (Note 2) .

Notes 1: • f(XIN)/4: when the BRG count source selection bit of the serial I/O control register is ‘0’.

• f(XIN)/16: when the BRG count source selection bit is ‘1’.

2: • BRG output/4 is used for the synchronous clock in clock synchronous serial I/O.

• BRG output/16 is used for the synchronous clock in clock asynchronous serial I/O.

Figure 1.14.6 shows the baud rate generator.

Figure 1.14.6 Baud Rate Generator

(6)

Bus Collision Detection Control Register

This register consists of the bits controlling the valid/invalid of the bus collision detection.

Figure 1.14.7 shows the bus collision detection control register.

Figure 1.14.7 Bus Collision Detection Control Register

Baud rate generator

b4 b3 b2 b1 b0

Function

At reset

Undefined

Baud rate generator (BRG) [Address 00E416]

• 8-bit timer for baud rate generation of serial I/O.

• Valid only when BRG output divided by 4 or 16 is selected

as synchronous clock.

Undefined

Bus collision detection control register

b4 b3 b2 b1 b0

Name

Function

At reset

Bus collision detection control register (BUSARBCON) [Address 00E516]

Bus collision detection enable bit

0 : Collision detection invalid

1 : Collision detection valid

Not implemented.

Writing to these bits is disabled.

These bits are ‘0’ at reading.

00 000 00

7480 Scheda tecnica(PDF) 130 Page - Renesas Technology Corp

7480 Scheda tecnica(HTML) 130 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

Scheda tecnica Scarica

Link URL