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25 R/F COnVeRTeR (RFC)
Setting 1 to CONEN disables the reference oscillation/sensor oscillation stop conditions so that the CR
oscillator will continue oscillating. Set SREF (reference oscillation), SSENA (sensor A oscillation), or
SSENB (sensor B oscillation) in the RFC_TRG register to 1 to start oscillation even in this mode, and
set to 0 to stop oscillation.
Using this function with the CR oscillation monitoring function helps easily measure the CR oscillation
clock frequency.
D6
eVTen: event Counter Mode enable Bit
Enables external clock input mode (event counter mode).
1 (R/W): External clock input mode
0 (R/W): Normal mode (default)
Setting EVTEN to 1 enables the external clock input to the RFINx pin. SREF (reference oscillation),
SSENA (sensor A oscillation), or SSENB (sensor B oscillation) should be used to control starting oscil-
lation (starting conversion) to perform converting operation even in this mode.
note: Do not input an external clock before setting EVTEN to 1. The RFINx pin is pulled down to V
when the pin function is switched for the R/F converter.
D[5:4]
SMODe[1:0]: Sensor Oscillation Mode Select Bits
Selects an oscillation mode.
SMODe[1:0]
For more information on the oscillation mode, see Section 25.4.1.
D[3:2]
Reserved
D1
ChSel: Conversion Channel Select Bit
Selects the channel to perform conversion.
1 (R/W): Ch.1
0 (R/W): Ch.0 (default)
The D[7:4] settings in this register and oscillation control using the RFC_TRG register are effective
only for the channel specified by CHSEL.
D0
RFCen: RFC enable Bit
Enables or disables the R/F converter.
1 (R/W): Enabled
0 (R/W): Disabled (default)
Setting RFCEN to 1 enables the R/F converter to start converting operations. When RFCEN is 0, ma-
nipulations of the RFC_TRG register for oscillation control are ineffective.
RFC Oscillation Trigger Register (RFC_TRG)
Register name address
Bit
RFC Oscillation
0x53a2
D15–3 –
Trigger Register
(16 bits)
D2
(RFC_TRG)
D1
D0
D[15:3]
Reserved
25-10
Table 25.
8.3 Oscillation Mode Selection
0x3
Reserved
0x2
DC oscillation mode for measuring capacitive sensors
0x1
AC oscillation mode for measuring resistive sensors
0x0
DC oscillation mode for measuring resistive sensors
name
Function
reserved
SSenB
Sensor B oscillation control/status
SSena
Sensor A oscillation control/status
SReF
Reference oscillation control/status 1 Start/Run
Seiko epson Corporation
Oscillation mode
(Default: 0x0)
Setting
–
1 Start/Run
0 Stop
1 Start/Run
0 Stop
0 Stop
S1C17624/604/622/602/621 TeChniCal Manual
SS
init. R/W
Remarks
–
–
0 when being read.
0
R/W
0
R/W
0
R/W
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