STMicroelectronics STM32F05 series User Manual

RM0091 Inter-integrated circuit (I
2
C) interface
Doc ID 018940 Rev 1 519/742
23.6 I
2
C debug mode
When the microcontroller enters debug mode (core halted), the SMBus timeout either
continues to work normally or stops, depending on the DBG_I2Cx_SMBUS_TIMEOUT
configuration bits in the DBG module..
23.7 I
2
C registers
Refer to Section 1.1 on page 34 for a list of abbreviations used in register descriptions.
The peripheral registers are accessed by words (32-bit).
23.7.1 Control register 1 (I2Cx_CR1)
Address offset: 0x00
Reset value: 0x0000 0000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. PECEN
ALERT
EN
SMBD
EN
SMBH
EN
GCEN
WUP
EN
NOSTR
ETCH
SBC
rw rw rw rw rw rw rw rw
15141312111098 7 6543210
RXDMA
EN
TXDMA
EN
SWRST
ANF
OFF
DNF ERRIE TCIE
STOP
IE
NACK
IE
ADDR
IE
RXIE TXIE PE
rw rw wrw rw rw rwrwrwrwrwrwrw
Bits 31:24 Reserved, must be kept at reset value.
Bit 23 PECEN: PEC enable
0: PEC calculation disabled
1: PEC calculation enabled
Note: If the SMBus feature is not supported, this bit is reserved and forced by hardware to ‘0’.
Please refer to Section 23.3: I2C implementation.
Bit 22 ALERTEN: SMBus alert enable
Device mode (SMBHEN=0):
0: Releases SMBA pin high and Alert Response Address Header disabled: 0001100x
followed by NACK.
1: Drives SMBA pin low and Alert Response Address Header enables: 0001100x followed
by ACK.
Host mode (SMBHEN=1):
0: SMBus Alert pin (SMBA) not supported.
1: SMBus Alert pin (SMBA) supported.
Note: When ALERTEN=0, the SMBA pin can be used as a standard GPIO.
If the SMBus feature is not supported, this bit is reserved and forced by hardware to ‘0’.
Please refer to Section 23.3: I2C implementation.
Bit 21 SMBDEN: SMBus Device Default address enable
0: Device default address disabled. Address 0b1100001x is NACKed.
1: Device default address enabled. Address 0b1100001x is ACKed.
Note: If the SMBus feature is not supported, this bit is reserved and forced by hardware to ‘0’.
Please refer to Section 23.3: I2C implementation.

STMicroelectronics STM32F05 series Specifications

General

Brand	STMicroelectronics
Model	STM32F05 series
Category	Microcontrollers
Language	English