1 OVERVIEW
S1C17M20/M21/M22/M23/M24/M25
Seiko Epson Corporation
1-9
TECHNICAL MANUAL (Rev. 1.0)
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)
P13
P13
I/O
Hi-Z
✓
I/O port
✓
✓
✓
FOUT
O
Clock external output
✓
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
✓
✓
✓
P14
P14
I/O
Hi-Z
✓
I/O port
✓
✓
✓
#ADTRG0
I
12-bit A/D converter Ch.0 trigger input
✓
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
✓
✓
✓
P15
P15
I/O
Hi-Z
✓
I/O port
✓
✓
✓
CLPLS
O
IR remote controller clear pulse output
✓
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
✓
✓
✓
P16
P16
I/O
Hi-Z
✓
I/O port
–
–
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
–
–
✓
P17
P17
I/O
Hi-Z
✓
I/O port
–
–
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
–
–
✓
P20
P20
I/O
Hi-Z
–
I/O port
–
–
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
–
–
✓
ADIN07
A
12-bit A/D converter Ch.0 analog signal input 7
–
–
✓
P21
P21
I/O
Hi-Z
–
I/O port
–
–
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
–
–
✓
ADIN06
A
12-bit A/D converter Ch.0 analog signal input 6
–
–
✓
P22
P22
I/O
Hi-Z
–
I/O port
–
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
–
✓
✓
ADIN05
A
12-bit A/D converter Ch.0 analog signal input 5
–
✓
✓
P23
P23
I/O
Hi-Z
–
I/O port
–
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
–
✓
✓
ADIN04
A
12-bit A/D converter Ch.0 analog signal input 4
–
✓
✓
P24
P24
I/O
Hi-Z
–
I/O port
✓
✓
✓
EXCL10
I
16-bit PWM timer Ch.1 event counter input 0
✓
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
✓
✓
✓
ADIN03
A
12-bit A/D converter Ch.0 analog signal input 3
✓
✓
✓
P25
P25
I/O
Hi-Z
–
I/O port
✓
✓
✓
EXCL11
I
16-bit PWM timer Ch.1 event counter input 1
✓
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
✓
✓
✓
ADIN02
A
12-bit A/D converter Ch.0 analog signal input 2
✓
✓
✓
P26
P26
I/O
Hi-Z
–
I/O port
✓
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
✓
✓
✓
ADIN01
A
12-bit A/D converter Ch.0 analog signal input 1
✓
✓
✓
P27
P27
I/O
Hi-Z
–
I/O port
✓
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
✓
✓
✓
ADIN00
A
12-bit A/D converter Ch.0 analog signal input 0
✓
✓
✓
P30
P30
I/O
Hi-Z
–
I/O port
✓
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
✓
✓
✓
VREFA0
A
12-bit A/D converter Ch.0 reference voltage input
✓
✓
✓
P31
P31
I/O
Hi-Z
✓
I/O port
✓
✓
✓
EXOSC
I
Clock generator external clock input
✓
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
✓
✓
✓
P32
P32
I/O
Hi-Z
✓
I/O port
✓
✓
✓
RTC1S
O
Real-time clock 1-second cycle pulse output
✓
✓
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
✓
✓
✓
EXSVD0
A
External power supply voltage detection input
✓
✓
✓
P33
P33
I/O
Hi-Z
✓
I/O port
–
–
✓
SENB0
A
R/F converter Ch.0 sensor B oscillator pin
–
–
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
–
–
✓
P34
P34
I/O
Hi-Z
✓
I/O port
–
–
✓
SENA0
A
R/F converter Ch.0 sensor A oscillator pin
–
–
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
–
–
✓
P35
P35
I/O
Hi-Z
✓
I/O port
–
–
✓
REF0
A
R/F converter Ch.0 reference oscillator pin
–
–
✓
UPMUX
I/O
User-selected I/O (universal port multiplexer)
–
–
✓