R28 datasheet(310/473 Pages) RENESAS

310 / 473 page

R8C/28 Group, R8C/29 Group

16. Clock Synchronous Serial Interface

Rev.2.10

Sep 26, 2008

Page 291 of 441

REJ09B0279-0210

16.3.2

Interrupt Requests

The I2C bus interface has six interrupt requests when the I2C bus format is used and four interrupt requests

when the clock synchronous serial format is used.

Table 16.7 lists the Interrupt Requests of I2C bus Interface.

Since these interrupt requests are allocated at the I2C bus interface interrupt vector table, determining the source

bit by bit is necessary.

STIE, NAKIE, RIE, TEIE, TIE: Bits in ICIER register

AL, STOP, NACKF, RDRF, TEND, TDRE: Bits in ICSR register

When the generation conditions listed in Table 16.7 are met, an I2C bus interface interrupt request is generated.

Set the interrupt generation conditions to 0 by the I2C bus interface interrupt routine. However, bits TDRE and

TEND are automatically set to 0 by writing transmit data to the ICDRT register and the RDRF bit is

automatically set to 0 by reading the ICDRR register. When writing transmit data to the ICDRT register, the

TDRE bit is set to 0. When data is transferred from registers ICDRT to ICDRS, the TDRE bit is set to 1 and by

further setting the TDRE bit to 0, 1 additional byte may be transmitted.

Set the STIE bit to 1 (enable stop condition detection interrupt request) when the STOP bit is set to 0.

Table 16.7

Interrupt Requests of I2C bus Interface

Interrupt Request

Generation Condition

Format

I2C bus

Clock

Synchronous

Serial

Transmit data empty

TXI

TIE = 1 and TDRE = 1

Enabled

Transmit ends

TEI

TEIE = 1 and TEND = 1

Enabled

Receive data full

RXI

RIE = 1 and RDRF = 1

Enabled

Stop condition detection

STPI

STIE = 1 and STOP = 1

Enabled

Disabled

NACK detection

NAKI

NAKIE = 1 and AL = 1 (or

NAKIE = 1 and NACKF = 1)

Enabled

Disabled

Arbitration lost/overrun error

Enabled

R28 Datasheet(PDF) 310 Page - Renesas Technology Corp

R28 Datasheet(HTML) 310 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