Epson S1C63558 4.6 I/O Ports (P00–P03, P10–P13, P20–P23and P30–P33), 4.6.1 Configuration of I/O ports, VDD, PXX, Table, EPSON, Data bus

CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (I/O Ports)

4.6 I/O Ports (P00–P03, P10–P13, P20–P23 and P30–P33)

4.6.1 Configuration of I/O ports

The S1C63558 has 16 bits general-purpose I/O ports. Figure 4.6.1.1 shows the configuration of the I/O port.

Pull-up control

Address register (PUL)

VDD

Data bus

Address

	Data	PXX
Address	register

I/O control

Address register (IOC)

Mask option

Fig. 4.6.1.1 Configuration of I/O port

The I/O port terminals P10– P13, P30–P33 are shared with the input/output terminals of the serial interface (1) and (2). The P22 and P23 terminals are shared with the special output (CL, FR) terminals. The software can select these functions to be used.

At initial reset, these are all set to the I/O port.

Table 4.6.1.1 shows the setting of the input/output terminals by function selection.

	Table 4.6.1.1	Function setting of input/output terminals
Terminal	Terminal status	Special output			Serial I/F (1), (2)
name	at initial reset	CL	FR	Async.	Clk-sync. Master		Clk-sync. Slave
P00–P03	P00–P03 (Input & Pull-up *)	P00–P03	P00–P03	P00–P03		P00–P03		P00–P03
P10	P10 (Input & Pull-up *)	P10	P10	SIN(I)		SIN(I)			SIN(I)
P11	P11 (Input & Pull-up *)	P11	P11	SOUT(O)	SOUT(O)		SOUT(O)
P12	P12 (Input & Pull-up *)	P12	P12	P12
						SCLK(O)			SCLK(I)
P13	P13 (Input & Pull-up *)	P13	P13	P13		P13
								SRDY(O)
P20	P20 (Input & Pull-up *)	P20	P20	P20		P20			P20
P21	P21 (Input & Pull-up *)	P21	P21	P21		P21			P21
P22	P22 (Input & Pull-up *)	CL	P22	P22		P22			P22
P23	P23 (Input & Pull-up *)	P23	FR	P23		P23			P23
P30	P30 (Input & Pull-up *)	P30	P30	SIN(I)		SIN(I)			SIN(I)
P31	P31 (Input & Pull-up *)	P31	P31	SOUT(O)	SOUT(O)		SOUT(O)
P32	P32 (Input & Pull-up *)	P32	P32	P32
						SCLK(O)			SCLK(I)
P33	P33 (Input & Pull-up *)	P33	P33	P33		P33
								SRDY(O)

∗When "with pull-up resistor" is selected by the mask option (high impedance when "gate direct" is set)

When these ports are used as I/O ports, the ports can be set to either input mode or output mode individually (in 1-bit unit). Modes can be set by writing data to the I/O control registers.

Refer to Section 4.11, "Serial Interface", for control of the serial interface.

S1C63558 TECHNICAL MANUAL EPSON 41