25 R/F COnVeRTeR (RFC)
S1C17624/604/622/602/621 TeChniCal Manual
Seiko epson Corporation
25-9
The R/F converter registers are described in detail below.
note: When data is written to the registers, the “Reserved” bits must always be written as 0 and not 1.
RFC Clock Control Registers (OSC_RFC)
Register name address
Bit
name
Function
Setting
init. R/W
Remarks
RFC Clock
Control Register
(OSC_RFC)
0x5067
(8 bits)
D7–4 –
reserved
–
–
–
0 when being read.
D3–2 RFTCKDV
[1:0]
RFC clock division ratio select
RFTCKDV[1:0] Division ratio
0x0 R/W When the clock
source is HSCLK
0x3
0x2
0x1
0x0
1/8
1/4
1/2
1/1
D1
RFTCKSRC RFC clock source select
1 OSC1
0 HSCLK
1
R/W
D0
RFTCKen RFC clock enable
1 Enable
0 Disable
0
R/W
D[7:4]
Reserved
D[3:2]
RFTCKDV[1:0]: RFC Clock Division Ratio Select Bits
Selects the division ratio for generating the TCCLK clock when HSCLK (IOSC or OSC3) is used as the
clock source.
8.2 HSCLK Division Ratio Selection
Table 25.
RFTCKDV[1:0]
Division ratio
0x3
1/8
0x2
1/4
0x1
1/2
0x0
1/1
(Default: 0x0)
D1
RFTCKSRC: RFC Clock Source Select Bit
Selects the count clock source.
1 (R/W): OSC1 (default)
0 (R/W): HSCLK (IOSC or OSC3)
D0
RFTCKen: RFC Clock enable Bit
Enables or disables the TCCLK clock supply.
1 (R/W): Enabled (on)
0 (R/W): Disabled (off) (default)
The RFTCKEN default setting is 0, which disables the clock supply. Setting RFTCKEN to 1 sends the
clock selected to the R/F converter.
RFC Control Register (RFC_CTl)
Register name address
Bit
name
Function
Setting
init. R/W
Remarks
RFC Control
Register
(RFC_CTl)
0x53a0
(16 bits)
D15–8 –
reserved
–
–
–
0 when being read.
D7
COnen
Continuous oscillation enable
1 Enable
0 Disable
0
R/W
D6
eVTen
Event counter mode enable
1 Enable
0 Disable
0
R/W
D5–4 SMODe[1:0] Sensor oscillation mode select
SMODE[1:0]
Sensor
0x0 R/W
0x3
0x2
0x1
0x0
reserved
DC capacitive
AC resistive
DC resistive
D3–2 –
reserved
–
–
–
0 when being read.
D1
ChSel
Conversion channel select
1 Ch.1
0 Ch.0
0
R/W
D0
RFCen
RFC enable
1 Enable
0 Disable
0
R/W
D[15:8] Reserved
D7
COnen: Continuous Oscillation enable Bit
Enables continuous oscillation by disabling the automatic CR oscillation stop function.
1 (R/W): Continuous oscillation enabled
0 (R/W): Continuous oscillation disabled (default)