I/O Cell Structure And Functions - Epson S1C17M20 Technical Manual

6 I/O PORTS (PPORT)
Peripheral I/O function 0 I/O control
Peripheral I/O function 1 I/O control
Peripheral I/O function 2 I/O control
Peripheral I/O function 3 I/O control
Clock
generator
Key-entry
reset signal
System reset
controller
Interrupt
controller

6.2 I/O Cell Structure and Functions

Figure 6.2.1 shows the I/O cell Configuration.
Pull-up/down Pull-up/down
Control signal
Input signal
Input control signal
Output signal
Output control signal
Analog signal
Analog signal
Analog control signal
Over voltage tolerant fail-safe type I/O cell
Refer to "Pin Descriptions" in the "Overview" chapter for the cell type, either the over voltage tolerant fail-safe
type I/O cell or the standard I/O cell, included in each port.
6-2
PPORT
Pxy
Pxy
Pxy
PxSELy
PxyMUX[1:0]
PxOUTy
PxOENy
PxIENy
PxPDPUy
PxRENy
PxCHATENy
CLKSRC[1:0]
PxINy
CLKDIV[3:0]
DBRUN
CLK_PPORT
Key-entry
PxEDGEy
reset control
PxINT
circuit
PxIFy
KRSTCFG[1:0]
PxIEy
Figure 6.1.1 PPORT Configuration
V
DD
control
R /
V INU
SS
R
IND
V
DD
∗ No diode is
connected at
V
the V side.
DD
DD
V
control SS
Figure 6.2.1 I/O Cell Configuration
Seiko Epson Corporation
GPIO/
peripheral I/O
GPIO function function
switching
General-purpose
circuit
I/O control
Chattering
filter
Interrupt
control circuit
Exist only in the ports that supports the interrupt function.
Pull-up/down
Control signal
Input signal
Input control signal
Output signal
Pxy
Output control signal
Analog signal
Analog control signal
Standard I/O cell
I/O cell
control signal
Output signal
I/O cell
Input signal
V
DD
Pull-up/down
control
R /
V INU
SS
R
IND
V
DD
V
DD
V
DD
Analog signal
V
control SS
S1C17M20/M21/M22/M23/M24/M25
TECHNICAL MANUAL (Rev. 1.0)
Pxy
Pxy