Description Of Operation; Fig. 13-4-2 Connections - Panasonic MN103001G/F01K User Manual

13.4.4 Description of Operation

UART Serial Interface connection
Two different connection methods are possible, one for unidirectional transfer, and the other for bi-directional
transfer.
The SBO pin is always an output, and the SBI pin is always an input.
SBO
SBI
SBT
Transmission
External
clock
Unidirectional transfer
UART serial interface bit rate
The UART serial interface has an internal 7-bit dedicated counter that supports fast bit rates even with a comparatively
slow clock source.
For example, when IOCLK is being used and a transfer is being performed, the division ratio should be set as
follows:
Note: When an external clock signal is used as the clock source, the high and low widths of the external clock must
be at least 10, 5, or 2.5 SYSCLK cycles when (MCLK frequency/SYSCLK frequency) = 1, 2, or 4, respectively.
SBO
SBI
SBT
Reception

Fig. 13-4-2 Connections

SBO
SBI
SBT
Transmission/
reception
External
clock
Bi-directional transfer
Serial Interface
SBO
SBI
SBT
Transmission/
reception
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