Epson S1C17624 Technical Manual page 110

9 i/O PORTS (P)
P3[7:4] Port Function Select Register (P34_37PMuX)
Register name address Bit
P3[7:4] Port 0x52a7 D7–6 P37MuX[1:0] P37 port function select
Function Select
(8 bits)
Register
(P34_37PMuX)
D5–4 P36MuX[1:0] P36 port function select
D3–2 P35MuX[1:0] P35 port function select
D1–0 P34MuX[1:0] P34 port function select
The P34 to P37 port pins are shared with the peripheral module pins. This register is used to select how the pins are
used.
D[7:6] P37MuX[1:0]: P37 Port Function Select Bits
0x3 (R/W): TOUT4 (T8OSC1)
0x2 (R/W): LFRO (LCD)
0x1 (R/W): TOUTN3 (T16E Ch.0)
0x0 (R/W): P37/EXCL6 (T16A2 Ch.1) (default)
To use the P37 pin for EXCL6 input, P3OEN7/P3_OEN register must be set to 0 and P3IEN7/P3_IEN
register must be set to 1. In addition to these settings, EXCL6S/P54_56PMUX register must be set to 0
in the S1C17624.
D[5:4] P36MuX[1:0]: P36 Port Function Select Bits
0x3 (R/W): Reserved
0x2 (R/W): RFCLKO (RFC)
0x1 (R/W): TOUT3 (T16E Ch.0)
0x0 (R/W): P36/EXCL5 (T16A2 Ch.0) (default)
To use the P36 pin for EXCL5 input, P3OEN6/P3_OEN register must be set to 0 and P3IEN6/P3_IEN
register must be set to 1. In addition to these settings, EXCL5S/P54_56PMUX register must be set to 0
in the S1C17624.
D[3:2] P35MuX[1:0]: P35 Port Function Select Bits
0x3 (R/W): Reserved
0x2 (R/W): #BFR (I2CS)
0x1 (R/W): FOUT1 (CLG)
0x0 (R/W): P35 (default)
D[1:0] P34MuX[1:0]: P34 Port Function Select Bits
0x3 (R/W): TOUTB6 (T16A2 Ch.1 comparator mode)
or CAPB6 (T16A2 Ch.1 capture mode)
0x2 (R/W): SDA0 (I2CM)
0x1 (R/W): SDA1 (I2CS)
0x0 (R/W): P34 (default)
9-20
name Function
Seiko epson Corporation
Setting
P37MUX[1:0] Function
0x3 TOUT4
0x2 LFRO
0x1 TOUTN3
0x0 P37/EXCL6
P36MUX[1:0] Function
0x3 reserved
0x2 RFCLKO
0x1 TOUT3
0x0 P36/EXCL5
P35MUX[1:0] Function
0x3 reserved
0x2 #BFR
0x1 FOUT1
0x0 P35
P34MUX[1:0] Function
0x3 TOUTB6/CAPB6
0x2 SDA0
0x1 SDA1
0x0 P34
(EXCL6 is available only in the S1C17624/604.)
(EXCL5 is available only in the S1C17624/604.)
(Selectable only in the S1C17624/604)
S1C17624/604/622/602/621 TeChniCal Manual
init. R/W Remarks
0x0 R/W EXCL6:
S1C17624/604 only
(Set EXCL6S to 0 in
S1C17624.)
0x0 R/W EXCL5:
S1C17624/604 only
(Set EXCL5S to 0 in
S1C17624.)
0x0 R/W
0x0 R/W TOUTB6/CAPB6:
S1C17624/604 only