Specifications

30 EPSON S1C6P466 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Output Ports)
4.5 Output Ports (R00–R03, R10–R13 and R20–R23)
4.5.1 Configuration of output ports
The S1C6P466 has 12 bits of general output ports.
The output specification of each output port is fixed at complementary output.
Figure 4.5.1.1 shows the configuration of the output port.
VDD
VSS
Rxx
Data bus
Address
Data register
Address
High impedance
control register
Fig. 4.5.1.1 Configuration of output port
The R02 and R03 output terminals are shared with special output terminals (TOUT, FOUT), and this
function is selected by the software. At initial reset, these are all set to the general purpose output port.
Table 4.5.1.1 shows the setting of the output terminals by function selection.
Table 4.5.1.1 Function setting of output terminals
Terminal
name
R00
R01
R02
R03
R10–R13
R20–R23
Terminal status
at initial reset
R00 (High output)
R01 (High output)
R02 (High output)
R03 (High output)
R10–R13 (High output)
R20–R23 (High output)
Special output
TOUT FOUT
R00 R00
R01 R01
TOUT
FOUT
R10–R13 R10–R13
R20–R23 R20–R23
When using the output port (R02, R03) as the special output port, the data register must be fixed at "1"
and the high impedance control register must be fixd at "0" (data output).
4.5.2 Mask option
In the S1C6P466, output specifications of all the output ports are fixed at complementary output.