
S1C6F567 TECHNICAL MANUAL
EPSON
31
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 S1C6F567 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 R00 to R03 output terminals are shared with the buzer/clock outputs (XBZ, BZ, TOUT, FOUT). The
R10 to R13 output terminals are shared with the tone/pulse dialer outputs (XTMUTE, XRMUTE, HDO,
HFO). These functions are 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
R11
R12
R13
R20–R23
Special output
Terminal status
at initial reset
R00 (HIGH output)
R01 (HIGH output)
R02 (HIGH output)
R03 (HIGH output)
R10 (HIGH output)
R11 (HIGH output)
R12 (HIGH output)
R13 (HIGH output)
R20–R23 (HIGH output)
FOUT
R00
R01
R02
FOUT
R10
R11
R12
R13
R20–R23
XRMUTE
R00
R01
R02
R03
R10
XRMUTE
R12
R13
R20–R23
XTMUTE
R00
R01
R02
R03
XTMUTE
R11
R12
R13
R20–R23
TOUT
R00
R01
TOUT
R03
R10
R11
R12
R13
R20–R23
BZ
R00
BZ
R02
R03
R10
R11
R12
R13
R20–R23
XBZ
R01
R02
R03
R10
R11
R12
R13
R20–R23
HFO
R00
R01
R02
R03
R10
R11
R12
HFO
R20–R23
HDO
R00
R01
R02
R03
R10
R11
HDO
R13
R20–R23
When using the output port 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 S1C6F567, output specifications of all the output ports are fixed at complementary output.