5. Pin Function and Description
5.
Pin Function and Description
Description
Reset signal
GENERAL (applies to S2R72A44/A43/A42)
Pin No.
Name
I/O
RESET
24
XRESET
IN
−
REFERENCE (applies to S2R72A44/A43/A42)
Pin No.
Name
I/O
RESET
44
45
47
XI
XO
R1
IN
OUT
IN
−
−
−
Description
Internal oscillator circuit input (12 MHz)
Internal oscillator circuit output (12 MHz)
Reference voltage setting pin (connect 12 kΩ±1% between VSS pins)
TEST (applies to S2R72A44/A43/A42)
Pin No.
Name
I/O
RESET
1
2
13
TSTEN
ATPGEN
TST0
IN (PD)
IN (PD)
IN
−
−
−
Description
Test pin (*): Not used by user
Test pin (*): Not used by user
Test pin (*): Not used by user
PD: Using pull-down I/O
*:
Fix as Low or pull down on board.
MODE (applies to S2R72A44/A43/A42)
Pin No.
Name
I/O
RESET
14
MODE0
IN
−
Description
USB Revision setting (*3)
0: USB 2.0 (High-speed compatible hub) 1: USB 1.1 (Full-speed hub)
Down ports’ VBUS setting pin
MODE1: bPwrOn2PwrGood selector setting pin
0: 0 ms, 1: 100 ms
MODE2: Gang/Individual selector pin
0: Gang, 1: Individual
22
MODE1
IN
−
23
MODE2
IN
−
MODE2 MODE1 VBUS Mode
H
H
Individual Mode
L
H
Gang Mode
H/L
L
Non-operation mode
Port setting pin
Setting availability
MODE4
0
0
1
1
MODE3
0
1
1
0
Ports
2 ports
3 ports
4 ports
n/a
A44
✓
✓
✓
-
A43
✓
✓
-
-
A42
✓
-
-
-
36
MODE3
IN
−
37
MODE4
IN
−
*3:
Operates at full-speed in USB 1.1 mode, even when connected to a USB 2.0 (high-speed) compatible USB
host.
6
Seiko Epson Corporation
S2R72A4x Series Data Sheet
(Rev.1.20)
EPSON [ EPSON COMPANY ]
