Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Technical Manual page 396

III PERIPHERAL BLOCK: INPUT/OUTPUT PORTS
Register name Address Bit
Port function 00402DF D7
extension (B) D6
register D5
D4
D3
D2
D1
D0
CFP07–CFP00: P0[7:0] function selection (D[7:0]) / P0 function select register (0x402D0)
CFP16–CFP10: P1[6:0] function selection (D[6:0]) / P1 function select register (0x402D4)
CFP27–CFP20: P2[7:0] function selection (D[7:0]) / P2 function select register (0x402D8)
CFP35–CFP30: P3[5:0] function selection (D[5:0]) / P3 function select register (0x402DC)
Selects the function of each I/O port pin.
Write "1": Used for peripheral circuit
Write "0": I/O port pin
Read: Valid
When a bit of the CFP register is set to "1", the corresponding pin is set for use with peripheral circuits (see Table
9.3). The pins for which register bits are set to "0" can be used as general-purpose I/O ports.
At cold start, CFP is set to "0" (I/O port). At hot start, CFP retains its state from prior to the initial reset.
P07D–P00D: P0[7:0] I/O port data (D[7:0]) / P0 I/O port data register (0x402D1)
P16D–P10D: P1[6:0] I/O port data (D[6:0]) / P1 I/O port data register (0x402D5)
P27D–P20D: P2[7:0] I/O port data (D[7:0]) / P2 I/O port data register (0x402D9)
P35D–P30D: P3[5:0] I/O port data (D[5:0]) / P3 I/O port data register (0x402DD)
This register reads data from I/O-port pins or sets output data.
When writing data
Write "1": High level
Write "0": Low level
When an I/O port is set for output, the data written to it is directly output to the I/O port pin. If the data written to
the port is "1", the port pin is set high (V
Even in the input mode, data can be written to the port data register.
When reading data
Read "1": High level
Read "0": Low level
The voltage level on the port pin is read out regardless of whether an I/O port is set for input or output mode. If the
pin voltage is high (V and V
DD
read out as input data.
At cold start, all data bits are set to "0". At hot start, they retain their state from prior to the initial reset.
B-III-9-8
Name Function
CFEX7 P07 port extended function
CFEX6 P06 port extended function
CFEX5 P05 port extended function
CFEX4 P04 port extended function
CFEX3 P31 port extended function
CFEX2 P21 port extended function
CFEX1 P10, P11, P13 port extended
function
CFEX0 P12, P14 port extended function
and V
DD DDE
level), "1" is read out as input data; if the pin voltage is low (V
DDE
Setting
1 #DMAEND3 0 P07, etc.
1 #DMAACK3 0 P06, etc.
1 #DMAEND2 0 P05, etc.
1 #DMAACK2 0 P04, etc.
1 #GARD 0 P31, etc.
1 #GAAS 0 P21, etc.
1 DST0 0 P10, etc.
DST1 P11, etc.
DPC0 P13, etc.
1 DST2 0 P12, etc.
DCLK P14, etc.
level); if the data is "0", the port pin is set low (V
EPSON
Init. R/W Remarks
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
0 R/W
1 R/W
1 R/W
level).
SS
level), "0" is
SS
S1C33L03 FUNCTION PART