Oki ML63611, User Manual

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ML63611 User’s Manual
Chapter 12 Serial Port (SIO)
12 – 19
OPTION B (D): 1.5 V (3.0 V), With regulator
circuit for LCD bias
OPTION A (C): 1.5 V (3.0 V), Without regulator
circuit for LCD bias
12.4.3 Receive Operation Description
(1) UART mode
The UART mode is specified by setting SRMOD (bit 0 of SRCON0) to “0”. Figure 12-8 is the UART mode
receive timing chart. The UART mode receive procedure is described below.
First set the receive baud rate in the receive baud rate setting register (SRBRT). Supported baud rates for
UART mode receive are 1200, 2400, 4800, and 9600 bps.
Set the receive format (data bit length, parity bit, etc.) in SRCON0 and SRCON1.
①
Set SREN (bit 3 of SRCON0) to “1” to enable receive.
②
At the negative edge of the receive data (RXD) start bit, receive operation will start.
③
Receive operation ends.
If a framing or overrun error occurs the FERR or OERR flag of the status register (SSTAT) will be set
to “1”.
④
Received data is transferred to SRBUFL/H.
If a parity error occurs, the PERR flag of the status register (SSTAT) is set to “1”.
⑤
The serial port receive interrupt request (SRINT) is generated.
Receive data is received until receive is disabled (SREN = “0”). When receive is ended, reset the receive
enable/disable flag (SREN) to “0”.
The receive data sampling clock (SRSMPL) is based on the low-speed clock supply, not on the high-speed
clock. This allows receive operations to be executed while in the energy-saving mode.