Epson S1C17001 Technical Manual page 71

7 OSCILLATOR CIRCUIT (OSC)
FOUT1 output
FOUT1 is the OSC1 clock.
Output pin setting
The FOUT1 output pin is combined with the P13 port. This functions as the P13 port pin by default, so the
pin function should be changed by writing 1 to P13MUX (D3/P1_PMUX register) if use is required for
FOUT1 output.
∗ P13MUX: P13 Port Function Select Bit in the P1 Port Function Select (P1_PMUX) Register (D3/0x52a1)
Clock output control
The clock output is controlled using the FOUT1E (D0/OSC_FOUT register). Setting FOUT1E to 1 outputs
the FOUT1 clock from the FOUT1 pin. Setting it to 0 halts output.
∗ FOUT1E: FOUT1 Output Enable Bit in the FOUT Control (OSC_FOUT) Register (D1/0x5064)
Note: Since the FOUT1 signal is asynchronized with FOUT1E writing, switching output on or off will
generate certain hazards.
62
FOUT1E 0
FOUT1 output (P13)
Figure 7.6.3: FOUT1 output
EPSON
1 0
S1C17001 TECHNICAL MANUAL