1 OVERVIEW
1-12
Seiko Epson Corporation
S1C33L26 TECHNICAL MANUAL
Pin Functions
1.3.2
The tables below list the S1C33L26 pin functions.
Notes: • Pin name
- The # prefixed to pin names indicates that the pin inputs/outputs an active low signal.
- The pin names listed in boldface denote the default pin (signal) name.
Each pin is assigned one to four functions and the function to be used must be selected us-
ing the corresponding port function select bit. See the “I/O Ports (GPIO)” chapter for more
information on the pin function selections.
- Be sure to avoid assigning the same signal to more than one pin.
• I/O
- The I/O listed in boldface and uppercase denote the default input/output direction.
- (H), (L), and (X) denote the initial output level, High, Low, and Undefined, respectively.
• PWR (power system)
- P1: LV
DD
- P2: HV
DD
- P3: RTCV
DD
- P4: AV
DD
- P5: PLLV
DD
• DC characteristics
- Output Type 1: I
OH
/I
OL
= 2 mA (HV
DD
= 3.0 V)
*
Type 2: I
OH
/I
OL
= 4 mA (HV
DD
= 3.0 V)
*
Type 3: I
OH
/I
OL
= 8 mA (HV
DD
= 3.0 V)
*
*
See “DC Characteristics” in the “Electrical Characteristics” chapter.
- PU/PD
PU:
Pull-up
PD:
Pull-down
PUc:
Pull-up with software control
(en):
Enabled by default
(dis): Disabled by default
3.2.1 List of Power Supply Pins
Table 1.
No.
Pin name
I/O
Description
Pin No.
Power voltage
TQFP15
128
TQFP24
144
PFBGA
180
1 HV
DD
– I/O power supply pin
1, 28,
58, 82,
109
1, 32,
65, 92,
121
C9, D4, D9, F11,
G11, K4, L10, L11
3.3 V typ. (2.7 to 3.6 V or
3.0 to 3.6 V when the USB
module is used.)
2 AV
DD
– Analog power supply pin
38
43
M5
3.3 V typ. (2.7 to 3.6 V or
3.0 to 3.6 V)
3 LV
DD
– Core power supply pin
14, 48,
70, 97,
118
16, 53,
78, 109,
132
C12, D6, D7, E4,
F4, J11, L8, M8
1.8 V typ. (1.65 to 1.95 V
or 1.7 to 1.9 V when a ce-
ramic resonator is used.)
4 RTCV
DD
– RTC/BBRAM power supply pin
33
37
N2
1.8 V typ. (= LV
DD
)
5 V
SS
– Ground pin
8, 22,
36, 51,
65, 76,
91, 104,
113,
124
8, 24,
40, 56,
73, 86,
101,
116,
127,
138
B4, C10, D8, D10,
E5, E6, E7, E8,
E9, E10, F5, F10,
G5, G10, H4, H5,
H10, H11, J4, J5,
J10, K5, K6, K7,
K8, K9, K10, K11,
L4, L5, L6, L7,
M6, M13, N3, N8
GND
6 PLLV
DD
– PLL power supply pin
47
52
M7
1.8 V typ. (= LV
DD
)
7 PLLV
SS
– PLL power supply ground pin
45
50
P7
GND (= V
SS
)