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18.2. Output Pins and External Connections
18.2.1. List of Output Pins
Table 18.2.1.1 shows the REMC3 pin.
Pin name
I/O*
REMO
O
CLPLS
O
If the port is shared with the REMC3 pin and other functions, the REMC3 output function must be
assigned to the port before activating the REMC3. For more information, refer to the "I/O Ports" chapter.
18.2.2. External Connections
Figure 18.2.2.1 shows a connection example between the REMC3 and an external infrared module.
Figure 18.2.2.1 Connection Example Between REMC3 and External Infrared Module
18.3. Clock Settings
18.3.1. REMC3 Operating Clock
When using the REMC3, the REMC3 operating clock CLK_REMC3 must be supplied to the REMC3
from the clock generator. The CLK_REMC3 supply should be controlled as in the procedure shown below.
1. Enable the clock source in the clock generator if it is stopped (refer to "Clock Generator" in the
"Power Supply, Reset, and Clocks" chapter).
2. Set the following REMC3CLK register bits:
REMC3CLK.CLKSRC[1:0] bits (Clock source selection)
-
REMC3CLK.CLKDIV[3:0] bits (Clock division ratio selection = Clock frequency setting)
-
18.3.2. Clock Supply in SLEEP Mode
When using REMC3 during SLEEP mode, the REMC3 operating clock CLK_REMC3 must be configured so
that it will keep supplying by writing 0 to the CLGOSC.xxxxSLPC bit for the CLK_REMC3 clock source.
If the CLGOSC.xxxxSLPC bit for the CLK_REMC3 clock source is 1, the CLK_REMC3 clock source is
deactivated during SLEEP mode and REMC3 stops with the register settings maintained at those before
entering SLEEP mode. After the CPU returns to normal mode, CLK_REMC3 is supplied and the REMC3
operation resumes.
18-2
Table 18.2.1.1 REMC3 pin.
Initial
status*
O (L)
IR remote controller transmit data output
O (L)
IR remote controller clear pulse output
* Indicates the status when the pin is configured for the REMC3.
TXD
REMO
VCC
VDD
LEDA
IR transmitter module
S1C31 REMC3
Seiko Epson Corporation
Function
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
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