1 OVERVIEW
1-8
Seiko Epson Corporation
S1C17M20/M21/M22/M23/M24/M25
TECHNICAL MANUAL (Rev. 1.0)
1.3.4 Pin Descriptions
Symbol meanings
Assigned signal: The signal listed at the top of each pin is assigned in the initial state. The pin function must be
switched via software to assign another signal (see the “I/O Ports” chapter).
I/O:
I
= Input
O
= Output
I/O
= Input/output
P
= Power supply
A
= Analog signal
Hi-Z
= High impedance state
Initial state:
I (Pull-up) = Input with pulled up
I (Pull-down) = Input with pulled down
Hi-Z
= High impedance state
O (H)
= High level output
O (L)
= Low level output
Tolerant fail-safe structure:
✓
= Over voltage tolerant fail-safe type I/O cell included (see the “I/O Ports” chapter)
Table 1.3.4.1 Pin description
Pin/pad
name
Assigned
signal
I/O Initial state
Tolerant
fail-safe
structure
Function
M20/M23 (24-pin)
M20/M23 M21/M24
(32-pin)
M22/M25 (48-pin)
V
DD
V
DD
P
–
–
Power supply (+)
✓
✓
✓
V
SS
V
SS
P
–
–
GND
✓
✓
✓
V
PP
V
PP
P
–
–
Power supply for Flash programming
✓
✓
✓
V
D1
V
D1
A
–
–
V
D1
regulator output
✓
✓
✓
OSC1
OSC1
A
–
–
OSC1 oscillator circuit input
–
✓
✓
OSC2
OSC2
A
–
–
OSC1 oscillator circuit output
–
✓
✓
#RESET
#RESET
I
I (Pull-up)
–
Reset input
✓
✓
✓
P00
P00
I/O
Hi-Z
✓
I/O port
✓
✓
✓
EXCL00
I
16-bit PWM timer Ch.0 event counter input 0
✓
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
✓
✓
✓
P01
P01
I/O
Hi-Z
✓
I/O port
✓
✓
✓
EXCL01
I
16-bit PWM timer Ch.0 event counter input 1
✓
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
✓
✓
✓
P02
P02
I/O
Hi-Z
✓
I/O port
✓
✓
✓
BZOUT
O
Sound generator output
✓
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
✓
✓
✓
P03
P03
I/O
Hi-Z
✓
I/O port
✓
✓
✓
#BZOUT
O
Sound generator inverted output
✓
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
✓
✓
✓
P04
P04
I/O
Hi-Z
✓
I/O port
–
–
✓
RFCLKO0
O
R/F converter Ch.0 clock monitor output
–
–
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
–
–
✓
P05
P05
I/O
Hi-Z
✓
I/O port
–
–
✓
RFCLKO1
O
R/F converter Ch.1 clock monitor output
–
–
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
–
–
✓
P06
P06
I/O
Hi-Z
✓
I/O port
–
–
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
–
–
✓
P07
P07
I/O
Hi-Z
✓
I/O port
–
–
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
–
–
✓
P10
P10
I/O
Hi-Z
✓
I/O port
–
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
–
✓
✓
P11
P11
I/O
Hi-Z
✓
I/O port
–
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
–
✓
✓
P12
P12
I/O
Hi-Z
✓
I/O port
✓
✓
✓
REMO
O
IR remote controller transmit data output
✓
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
✓
✓
✓