Epson Arm S1C31 Series Technical Manual page 46

Bit 11–10 OSC3FQ[1:0]
These bits set the oscillation frequency of the OSC3 internal oscillator circuit.
Bit 9 OSC3MD
This bit selects an oscillator type of the OSC3 oscillator circuit.
1 (R/WP): Crystal/ceramic oscillator
0 (R/WP): Internal oscillator
Bits 8–6 Reserved
Bits 5–4 OSC3INV[1:0]
These bits set the oscillation inverter gain when crystal/ceramic oscillator is selected as the OSC3 os-
cillator type.
Bit 3 OSC3STM
This bit controls the OSC3CLK auto-trimming function.
1 (WP): Start trimming
0 (WP): Stop trimming
1 (R): Trimming is executing.
0 (R): Trimming has finished. (Trimming operation inactivated.)
This bit is automatically cleared to 0 when trimming has finished.
Notes: • The auto-trimming function does not work if the OSC1 oscillator circuit is stopped. Make
sure the CLGINTF.OSC1STAIF bit is set to 1 before starting the trimming operation.
• Be sure to avoid altering the CLGOSC3.OSC3FQ[1:0] bits while the auto-trimming is being
executed.
Bits 2–0 OSC3WT[2:0]
These bits set the oscillation stabilization waiting time for the OSC3 oscillator circuit.
Table 2.6.11 OSC3 Oscillation Stabilization Waiting Time Setting
S1C31D41 TECHNICAL MANUAL
(Rev. 1.1)
Table 2.6.9 OSC3CLK Frequency Selection
CLGOSC3.OSC3FQ[1:0] bits
0x3
0x2
0x1
0x0
Table 2.6.10 OSC3 Oscillation Inverter Gain Setting
CLGOSC3.OSC3INV[1:0] bits
0x3
0x2
0x1
0x0
CLGOSC3.OSC3WT[2:0] bits
0x7
0x6
0x5
0x4
0x3–0x0
Seiko Epson Corporation
2 POWER SUPPLY, RESET, AND CLOCKS
OSC3CLK frequency
16 MHz
Reserved
8 MHz
4 MHz
Inverter gain
Max.
↑
↓
Min.
Oscillation stabilization waiting time
65,536 clocks
16,384 clocks
8,192 clocks
4,096 clocks
Setting prohibited
2-21