RM0312 datasheet(184/275 Pages) STMICROELECTRONICS

184 / 275 page

Inter-integrated circuit (I2C) interface

RM0312

184/275

DocID022352 Rev 3

19.5

I2C low power modes

19.6

I2C interrupts

Table 38. I2C interface behavior in low power modes

Mode

Description

Wait

No effect on I2C interface.

I2C interrupts cause the device to exit from Wait mode.

Halt

In slave mode: Communication is reset, except for configuration registers. Device is in

slave mode.

Wakeup from Halt interrupt is generated if ITEVTEN = 1 and address matched (including

allowed headers).

The matched address is not acknowledged in Halt mode so the master has to send it

again when the CPU is woken up to receive an acknowledge.

If NOSTRETCH = 0, SCLH will be stretched after acknowledge pulse in Halt mode until

WUFH is cleared by software;

None of the flags are set by the address which wakes up the CPU.

In master mode: Communication is frozen until the CPU is woken up. Wakeup from Halt

flag and interrupt are generated if ITEVTEN=1 and there is a HALT instruction.

Note:

It is forbidden to enter Halt mode while a communication is on

going.

Table 39. I2C Interrupt requests

Interrupt event

Event

flag

Enable

control

bit

Exit

from

Wait

Exit

from

Halt

Start bit sent (Master)

ITEVTEN

Yes

Address sent (Master) or Address matched

(Slave)

ADDR

10-bit header sent (Master)

ADD10

Stop received (Slave)

STOPF

Data byte transfer finished

BTF

Wakeup from Halt

WUFH

ITEVTEN

Yes

Receive buffer not empty

RXNE

ITEVTEN

and

ITBUFEN

Transmit buffer empty

TXE

Bus error

BERR

ITERREN

Arbitration loss (Master)

ARLO

Acknowledge failure

Overrun/underrun

OVR

RM0312 датащи(PDF) 184 Page - STMicroelectronics

RM0312 датащи(HTML) 184 Page - STMicroelectronics

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

датащи скачать

ссылки URL