Epson S1C63558 - Manual (Page 51)

S1C63558 TECHNICAL MANUAL EPSON 41
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.
Address
Data
register
Data bus P XX
Address
Address
Address
I/O control
register (IOC)
Pull-up control
register (PUL)
Mask option
V DD
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
name
P00–P03
P10
P11
P12
P13
P20
P21
P22
P23
P30
P31
P32
P33
Special output Serial I/F (1), (2) Terminal status
at initial reset
P00–P03 (Input & Pull-up *)
P10 (Input & Pull-up *)
P11 (Input & Pull-up *)
P12 (Input & Pull-up *)
P13 (Input & Pull-up *)
P20 (Input & Pull-up *)
P21 (Input & Pull-up *)
P22 (Input & Pull-up *)
P23 (Input & Pull-up *)
P30 (Input & Pull-up *)
P31 (Input & Pull-up *)
P32 (Input & Pull-up *)
P33 (Input & Pull-up *)
CL
P00–P03
P10
P11
P12
P13
P20
P21
CL
P23
P30
P31
P32
P33
Clk-sync. Master
P00–P03
SIN(I)
SOUT(O)
SCLK(O)
P13
P20
P21
P22
P23
SIN(I)
SOUT(O)
SCLK(O)
P33
Clk-sync. Slave
P00–P03
SIN(I)
SOUT(O)
SCLK(I)
SRDY(O)
P20
P21
P22
P23
SIN(I)
SOUT(O)
SCLK(I)
SRDY(O)
FR
P00–P03
P10
P11
P12
P13
P20
P21
P22
FR
P30
P31
P32
P33
Async.
P00–P03
SIN(I)
SOUT(O)
P12
P13
P20
P21
P22
P23
SIN(I)
SOUT(O)
P32
P33
∗
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 indi-
vidually (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.