2 POWER SUPPLY, RESET, AND CLOCKS
2-18
Seiko Epson Corporation
S1C17M20/M21/M22/M23/M24/M25
TECHNICAL MANUAL (Rev. 1.0)
Table 2.6.5 Setting Oscillation Inverter Gain at OSC1 Boost Startup
CLGOSC1.INV1B[1:0] bits
Inverter gain
0x3
Max.
0x2
↑
0x1
↓
0x0
Min.
Note: The CLGOSC1.INV1B[1:0] bits must be set to a value equal to or larger than the CLGOSC1.
INV1N[1:0] bits.
Bits 5–4
INV1N[1:0]
These bits set the oscillation inverter gain applied at normal operation of the OSC1 crystal oscillator
circuit.
Table 2.6.6 Setting Oscillation Inverter Gain at OSC1 Normal Operation
CLGOSC1.INV1N[1:0] bits
Inverter gain
0x3
Max.
0x2
↑
0x1
↓
0x0
Min.
Bits 3–2
Reserved
Bits 1–0
OSC1WT[1:0]
These bits set the oscillation stabilization waiting time for the OSC1 oscillator circuit.
Table 2.6.7 OSC1 Oscillation Stabilization Waiting Time Setting
CLGOSC1.OSC1WT[1:0] bits
Oscillation stabilization waiting time
0x3
65,536 clocks
0x2
16,384 clocks
0x1
4,096 clocks
0x0
Reserved
CLG OSC3 Control Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
CLGOSC3
15–12 –
0x0
–
R
–
11–10 OSC3FQ[1:0]
0x1
H0
R/WP
9
OSC3MD
0
H0
R/WP
8
–
0
–
R
7–6 –
0x0
–
R
5–4 OSC3INV[1:0]
0x3
H0
R/WP
3
OSC3STM
0
H0
R/WP
2–0 OSC3WT[2:0]
0x6
H0
R/WP
Bits 15–12 Reserved
Bits 11–10 OSC3FQ[1:0]
These bits set the oscillation frequency of the OSC3 internal oscillator circuit.
Table 2.6.8 Setting Oscillation Frequency of OSC3 Internal Oscillator Circuit
CLGOSC3.OSC3FQ[1:0] bits
Oscillation frequency
0x3
Reserved
0x2
20 MHz
0x1
16 MHz
0x0
12 MHz
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