
S1S60000 Technical Manual
Rev.1.5
EPSON
13
Functions of each pin are as shown in Table 2.2.
Table 2.2
Pin Functions when Start-Stop Synchronous Serial is selected
Pin
Name
In/Out
Function
GPIO15
1
DTR#
O
Data Terminal Ready
Indicates that data receiving is enabled.
It is a LOW active
signal.
Enters the Low status after initialization in the serial
emulation mode.
Normally High status in the hardware control
mode.
GPIO14
2
RTS#
O
Request to Send
Indicates that data transmission is enabled.
It is a LOW active
signal.
Enters the Low status when receiving is possible in the
serial emulation mode.
Hardware control mode is normally Low
status.
GPIO13
3
DSR#
I
Data Set Ready
Input of the state that transmission from outside is enabled.
Currently not used.
GPIO12
4
CTS#
I
Clear to Send
Input of the state that receive from outside is enabled. It is a
LOW active signal. When this pin goes HIGH, transmission is
temporarily suspended, and when it returns to LOW,
transmission is resumed.
Since this operation is controlled
according to the interrupt-based software control, the time from
the transmission stop to the resumption after signal change is
uncertain.
So, the external device is requested to start the
control when the buffer capacity is sufficient to some extent
GPIO11
5
-
GPIO10
6
MODE
I
Mode Select
Used to switch over normal/hardware control modes.
Be sure
to set this pin to LOW in the normal mode.
GPIO9
7
TXD
O
Transmit Data
Serial transmit data
GPIO8
8
RXD
I
Receive Sata
Serial transmit data
TXD and RXD are start-stop synchronous serial pins to be transmitted/received by use of the serial interface Ch.0
function of the built-in S1C33240.
For details, refer to the serial interface specifications in the technical
manual for the S1C33240.
Other control lines are controlled by the software.
CTS# signals are processed by
internal interruptions.
2.4
Power Supply
2.4.1
Operating Voltage
S1S60000 operates with the voltage supplid across VDD and VSS.
This operating voltage is as shown below.
VDD = 3.3
±0.3V(VSS = GND)
Note: S1S60000 has 7 VDD pins and 6 VSS pins.
Be sure to connect every pin to the power supply so that any
of them may not become open.
2.5
Power on Reset
Be sure to implement initial reset at powering on in order to ensure normal start of S1S60000.
Schmitt input is
applied RESET#.