24 I/O PORTS (GPIO)
24-42
Seiko Epson Corporation
S1C33L26 TECHNICAL MANUAL
PC[7:4] Port Function Select Register (PMUX_PC_47)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
PC[7:4] Port
Function Select
Register
(PMUX_PC_47)
0x300819
(8 bits)
D7–6 CFPC7[1:0] PC7 port function select
CFPC7[1:0]
Function
0x0 R/W Write-protected
0x3
0x2
0x1
0x0
reserved
reserved
PC7
D15
D5–4 CFPC6[1:0] PC6 port function select
CFPC6[1:0]
Function
0x0 R/W
0x3
0x2
0x1
0x0
reserved
reserved
PC6
D14
D3–2 CFPC5[1:0] PC5 port function select
CFPC5[1:0]
Function
0x0 R/W
0x3
0x2
0x1
0x0
reserved
reserved
PC5
D13
D1–0 CFPC4[1:0] PC4 port function select
CFPC4[1:0]
Function
0x0 R/W
0x3
0x2
0x1
0x0
reserved
reserved
PC4
D12
The GPIO pins are shared with the peripheral module pins. This register is used to select how the pins are used.
D[7:6]
CFPC7[1:0]: PC7 Port Function Select Bits
0x3 (R/W): Reserved
0x2 (R/W): Reserved
0x1 (R/W): PC7 (GPIO)
0x0 (R/W): D15 (SRAMC) (default)
D[5:4]
CFPC6[1:0]: PC6 Port Function Select Bits
0x3 (R/W): Reserved
0x2 (R/W): Reserved
0x1 (R/W): PC6 (GPIO)
0x0 (R/W): D14 (SRAMC) (default)
D[3:2]
CFPC5[1:0]: PC5 Port Function Select Bits
0x3 (R/W): Reserved
0x2 (R/W): Reserved
0x1 (R/W): PC5 (GPIO)
0x0 (R/W): D13 (SRAMC) (default)
D[1:0]
CFPC4[1:0]: PC4 Port Function Select Bits
0x3 (R/W): Reserved
0x2 (R/W): Reserved
0x1 (R/W): PC4 (GPIO)
0x0 (R/W): D12 (SRAMC) (default)
Port Noise Filter Control Register (GPIO_FILTER)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
Port Noise
Filter Control
Register
(GPIO_FILTER)
0x30083e
(8 bits)
D7–1 –
reserved
–
–
–
0 when being read.
D0
ANFEN
Input port noise filter enable
1 Enable
0 Disable
0
R/W Write-protected
D[7:1]
Reserved
D0
ANFEN: Input Port Noise Filter Enable Bit
Enables or disables the noise filters for peripheral input ports.
1 (R/W): Enabled
0 (R/W): Disabled (default)
Setting 1 to ANFEN enables the noise filters to remove noise on the signals input from the ports shown
below.