C Bus; I2C Function Pin Switch; Registers Related To I; 587 - STC micro STC8A8K64D4 Series Reference Manual

STC8A8K64D4 Series Manual

C Bus

C serial bus controller is integrated in the STC8A8K64D4 series of microcontrollers. I

synchronous communication bus, which uses SCL (clock line) and SDA (data line) to carry out two-wire synchronous

communication. For the pin allocation of SCL and SDA, STC8A8K64D4 series of microcontrollers provide pin switch

mode that can switch SCL and SDA to different I/O pins. Therefor, it is convenience to use a set of I

C buses through time sharing.

Compared with the standard I

No arbitration will be performed after the start signal (START) is sent.

No timeout detection when the clock signal (SCL) stays at low level.

C bus of the STC8A8K64D4 series of microcontrollers offer two modes of operation: master mode (SCL is

the output port, which is used to transmit synchronous clock signal) and slave mode (SCL is the input port, which is

used to receive the synchronous clock signal).

STC innovation: When the I

pin can wake up the MCU which is in power-down mode. (Note: Due to the fast I

of data after the MCU wakes up is generally incorrect.)

I2C_S[1:0]: I

C function pin selection bit

I2C Configuration Register

C Master Control Register

C Master Status Register

C Slave Control Register

C Slave Status Register

C Slave Address Register

C Data Transmission Register

C Data Receive Register

C Master Auxiliary Control

C protocol, the following two mechanisms are ignored:

C serial bus controller of STC works in slave mode, the falling edge signal of SDA

C transmission speed, the first packet

Bit Address and Symbol

MSSPEED[6:1]

C is a high-speed

C as multiple sets

MSACKI MSACKO

TXING SLACKI

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