Sony Ericsson GM47, GM48 manual Serial Data Interfaces, Pcmclk Pcmsyn Pcmout

2. SYSTEM CONNECTOR INTERFACE

Typical Rise/Fall times	Rise Time	Fall Time	Unit
PCMCLK	19	18	ns
PCMSYN	19	15	ns
PCMOUT	900	900	ns
PCMDLD	20	19	ns

2.8 Serial Data Interfaces

Pin	Signal	Dir	Description	RS232
				CCITT Nº
41	TD	I	Serial data to module (UART1)	103
42	RD	O	Serial data from module (UART1)	104
39	RTS	I	Request To Send (UART1)	105
40	CTS	O	Clear To Send (UART1)	106
37	DTR	I	Data Terminal Ready (UART1)	108.2
38	DCD	O	Data Carrier Detect (UART1)	109
36	RI	O	Ring Indicator (UART1)	125
45	TD2	I	UART2 Data Transmission
46	RD2	O	UART2 Data Reception
43	TD3	I	UART3 Data Transmission
44	RD3	O	UART3 Data Reception

The serial channels, consisting of three UARTs, are asynchronous communication links to the application or accessory units. UART1 has RS-232 functionality. UART2 and UART3 behave as general-purpose serial data links. In addition they are used for accessories and GPS respectively.

Digital 2.75V CMOS input/output electrical characteristics apply.

The standard character format consists of 1 start bit, 8 bit data, no parity and 1 stop bit. In all, there are 10 bits per character.

2.8.1 UART1 (RS232) - RD, TD, RTS, CTS, DTR, DCD and RI

UART1 signals conform to a 9-pin RS232 (V.24) serial port, except for

the DSR (CCITT No 107) signal. The DSR signal has been removed as it is usually connected to DTR in most systems.

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