Input/Output Port Pin Function Selection (Port Mux) - Epson S1C17001 Technical Manual

10 INPUT/OUTPUT PORT (P)
10.2 Input/Output Pin Function Selection (Port MUX)
The input/output port pins share peripheral module input/output pins (with certain exceptions). Each pin can be set
for use as an input/output port or for peripheral modules via the corresponding port function selection bits for each
port. Pins not used for peripheral modules can be used as general purpose input/output ports.
Pin function 1
PxxMUX = 0
P00 –
P01 –
P02 –
P03 –
P04 REMI (REMC)
P05 REMO (REMC)
P06/EXCL2 (T16CH2) –
P07/EXCL1 (T16CH1) –
P10 –
P11 –
P12 –
P13 FOUT1 (OSC)
P14 SDA (I2C)
P15 SCL (I2C)
P16/EXCL0 (T16CH0) –
P17 #SPISS (SPI)
P20 SDI (SPI)
P21 SDO (SPI)
P22 SPICLK (SPI)
P23 SIN (UART)
P24 SOUT (UART)
P25 SCLK (UART)
P26 TOUT (T16E)
P27 EXCL3 (T16E)
P30 FOUT3 (OSC)
DCLK (DBG) P31
DST2 (DBG) P32
DSIO (DBG) P33
Resetting the input/output port pins (Pxx) resets them to their default functions (pin function 1 in Table 10.2.1).
Pins P06, P07, and P16 can also be used as 16-bit timer external clock input pins by setting them to input mode.
Note, however, that no port function selection bits are available, since they are simultaneously set to function as
general purpose input ports.
For information on functions other than the input/output ports, refer to the discussion of the peripheral modules in-
dicated in parentheses. The sections below discuss port functions with the pins set as general purpose input/output
ports.
84
Table 10.2.1: Input/output pin function selection
Pin function 2 Port function
PxxMUX = 1 selection bit
–
–
–
–
P04MUX (D4) P0 Port Function Select (P0_PMUX) Register (0x52a0)
P05MUX (D5)
–
–
–
–
–
P13MUX (D3) P1 Port Function Select (P1_PMUX) Register (0x52a1)
P14MUX (D4)
P15MUX (D5)
–
P17MUX (D7) P1 Port Function Select (P1_PMUX) Register (0x52a1)
P20MUX (D0) P2 Port Function Select (P2_PMUX) Register (0x52a2)
P21MUX (D1)
P22MUX (D2)
P23MUX (D3)
P24MUX (D4)
P25MUX (D5)
P26MUX (D6)
P27MUX (D7)
P30MUX (D0) P3 Port Function Select (P3_PMUX) Register (0x52a3)
P31MUX (D1)
P32MUX (D2)
P33MUX (D3)
–
–
–
–
–
–
–
–
–
–
EPSON
Control register
S1C17001 TECHNICAL MANUAL