Epson S1C17704 Technical Manual page 91

FOUT1 output
FOUT1 is the OSC1 clock.
Setting up the output pin
The FOUT1 output pin is shared with the P13 port and it functions as the P13 port pin by default. Write 1
to P13MUX (D3/P1_PMUX register) to switch the P13 pin function for the FOUT1 output.
∗ P13MUX: P13 Port Function Select Bit in the P1 Port Function Select (P1_PMUX) Register (D3/0x52a1)
Controlling the clock output
Use FOUT1E (D0/OSC_FOUT register) to control the clock output. When FOUT1E is set to 1, the FOUT1
clock is output from the FOUT1 pin and the output is disabled when FOUT1E is set to 0.
∗ FOUT1E: FOUT1 Output Enable Bit in the FOUT Control (OSC_FOUT) Register (D0/0x5064)
Note: The FOUT1 signal is generated asynchronously with writing to FOUT1E, therefore, a hazard will
occur when the output is enabled or disabled.
S1C17704 TECHNICAL MANUAL
FOUT1E 0
FOUT1 output (P13)
Figure 7.7.3 FOUT1 Output
EPSON
7 OSCILLATOR (OSC)
1 0
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