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20 R/F CONVERTER (RFC)
Bit 0
SREF
This bit controls CR oscillation for the reference resistor. This bit also indicates the CR oscillation sta-
tus.
1 (W):
Start oscillation
0 (W):
Stop oscillation
1 (R):
Being oscillated
0 (R):
Stopped
Notes: • Settings in this register are all ineffective when the RFC_nCTL.MODEN bit = 0 (RFC operation
disabled).
• When writing 1 to the RFC_nTRG.SREF bit, the RFC_nTRG.SSENA bit, or the RFC_nTRG.
SSENB bit to start oscillation, be sure to avoid having more than one bit set to 1.
• Be sure to clear the interrupt flags (RFC_nINTF.EREFIF bit, RFC_nINTF.ESENAIF bit, RFC_
nINTF.ESENBIF bit, RFC_nINTF.OVMCIF bit, and RFC_nINTF.OVTCIF bit) before starting os-
cillation using this register.
RFC Ch.n Measurement Counter Low and High Registers
Register name
Bit
RFC_nMCL
15–0 MC[15:0]
RFC_nMCH
15–8 –
7–0 MC[23:16]
Or
Register name
Bit
RFC_nMCL
31–24 –
RFC_nMCH
23–0 MC[23:0]
Bits 31–24 Reserved
Bits 23–0 MC[23:0]
Measurement counter data can be read and written through these bits.
Note: The measurement counter must be set from the low-order value (RFC_nMCL.MC[15:0] bits) first
when data is set using a 16-bit access instruction. The counter may not be set to the correct
value if the high-order value (RFC_nMCH.MC[23:16] bits) is written first.
RFC Ch.n Time Base Counter Low and High Registers
Register name
Bit
RFC_nTCL
15–0 TC[15:0]
RFC_nTCH
15–8 –
7–0 TC[23:16]
Or
Register name
Bit
RFC_nTCL
31–24 –
RFC_nTCH
23–0 TC[23:0]
Bits 31–24 Reserved
Bits 23–0 TC[23:0]
Time base counter data can be read and written through these bits.
Note: The time base counter must be set from the low-order value (RFC_nTCL.TC[15:0] bits) first when
data is set using a 16-bit access instruction. The counter may not be set to the correct value if
the high-order value (RFC_nTCH.TC[23:16] bits) is written first.
20-10
Bit name
Initial
0x0000
0x00
0x00
Bit name
Initial
0x00
0x000000
Bit name
Initial
0x0000
0x00
0x00
Bit name
Initial
0x00
0x000000
Seiko Epson Corporation
Reset
R/W
H0
R/W
–
–
R
–
H0
R/W
Reset
R/W
–
R
–
H0
R/W
Reset
R/W
H0
R/W
–
–
R
–
H0
R/W
Reset
R/W
–
R
–
H0
R/W
S1C31D50/D51 TECHNICAL MANUAL
Remarks
Remarks
Remarks
Remarks
(Rev. 2.00)
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