19 R/F CONVERTER (RFC)
19-10
Seiko epson Corporation
S1C17F13 TeChniCal Manual
(Rev. 1.0)
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
n
CTL.MODEN bit = 0 (RFC operation
disabled).
•
When writing 1 to the RFC
n
TRG.SREF bit, the RFC
n
TRG.SSENA bit, or the RFC
n
TRG.
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
n
INTF.EREFIF bit, RFC
n
INTF.ESENAIF bit, RFC
n
INTF.
ESENBIF bit, RFC
n
INTF.OVMCIF bit, and RFC
n
INTF.OVTCIF bit) before starting oscillation
using this register.
RFC Ch.
n
Measurement Counter low and high Registers
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
RFC
n
MCL
15–0 MC[15:0]
0x0000
H0
R/W –
RFC
n
MCH
15–8 –
0x00
–
R
–
7–0 MC[23:16]
0x00
H0
R/W
Or
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
RFC
n
MCL
RFC
n
MCH
31–24 –
0x00
–
R
–
23–0 MC[23:0]
0x000000
H0
R/W
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
n
MCL.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
n
MCH.MC[23:16] bits) is written first.
RFC Ch.
n
Time Base Counter low and high Registers
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
RFC
n
TCL
15–0 TC[15:0]
0x0000
H0
R/W –
RFC
n
TCH
15–8 –
0x00
–
R
–
7–0 TC[23:16]
0x00
H0
R/W
Or
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
RFC
n
TCL
RFC
n
TCH
31–24 –
0x00
–
R
–
23–0 TC[23:0]
0x000000
H0
R/W
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
n
TCL.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
n
TCH.TC[23:16] bits) is written first.