CMS32L051 User Manual |Chapter 12 Universal Serial Communication Unit
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12.9.1 Address segment transmission
Address segment sending is the first transmission operation to specifically specify the transmitting object
(slave device) that is the first to occur during I
2
C communication. After generating the start condition, the
address (7 bits) and the transmission direction (1 bit) are sent as 1 frame.
Limited to end-of-transmit interrupts (buffer null interrupts cannot be
selected).
ACK Error Detection Flag (PEFmn).
The length of the
transmitted data
8 bits (send the highest 7 bits as the address and the lower 1 bit as R/W
control).
Max.f MCK/4[Hz] (SDRmn [15:9] f
MCK
: The operating clock frequency of
the object channel, however, must meet the following conditions in each
mode of I
2
C:
).
).
).
Normal-phase output (default: high).
Appeding 1 bit (for ACK reception).
Note 1. To communicate via Simplified I
2
C, N-channel open-drain output mode (POMxx=1) must be set through the
port output mode register (POMxx). For details, please refer to Chapter 2 Pin Functions
2. It must be used within the scope of the peripheral functional characteristics that meet this condition and meet the
electrical characteristics (refer to the data sheet).
Remarks m: Unit number (m=0, 1) n: Channel number (n=0~3)mn=00~ 03, 10~11.
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