1 OVERVIEW
1-10
Seiko Epson Corporation
S1C17M12/M13 TECHNICAL MANUAL
(Rev. 1.2)
Universal port multiplexer (UPMUX)
The universal port multiplexer (UPMUX) allows software to select the peripheral circuit input/output function
to be assigned to each pin from those listed below.
Table 1.3.3.2 Peripheral Circuit Input/output Function Selectable by UPMUX
Peripheral circuit
Signal to be assigned I/O
Channel number n
Function
Synchronous serial
interface (SPIA)
SDIn
I
n = 0, 1
SPIA Ch.n data input
SDOn
O
SPIA Ch.n data output
SPICLKn
I/O
SPIA Ch.n clock input/output
#SPISSn
I
SPIA Ch.n slave-select input
I
2
C (I2C)
SCLn
I/O n = 0
I2C Ch.n clock input/output
SDAn
I/O
I2C Ch.n data input/output
UART (UART3)
USINn
I
n = 0
UART3 Ch.n data input
USOUTn
O
UART3 Ch.n data output
16-bit PWM timer (T16B) TOUTn0/CAPn0
I/O n = 0
T16B Ch.n PWM output/capture input 0
TOUTn1/CAPn1
I/O
T16B Ch.n PWM output/capture input 1
Note: Do not assign a function to two or more pins simultaneously.