6 CLOCK MANAGEMENT UNIT (CMU)
6-26
Seiko Epson Corporation
S1C33L26 TECHNICAL MANUAL
PLL Control Register 2 (CMU_PLLCTL2)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
PLL Control
Register 2
(CMU_
PLLCTL2)
0x30010a
(8 bits)
D7–6 PLLCS[1:0] PLL LPF capacitance
0x0
0x0
R
D5
PLLBYP
PLL bypass mode
0
0
R
D4–0 PLLCP[4:0] PLL charge pump current
0x10
0x10
R
D[7:6]
PLLCS[1:0]: PLL LPF Capacitance Bits
Indicates the LPF capacitance value (CS value). (Default: 0x0)
D5
PLLBYP: PLL Bypass Mode Bit
Indicates the mode when the PLL is bypassed. (Default: 0)
D[4:0]
PLLCP[4:0]: PLL Charge Pump Current Bits
Indicates the charge pump current value (CP value). (Default: 0x10)
SSCG Macro Control Register 0 (CMU_SSCG0)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
SSCG Macro
Control Register
0
(CMU_SSCG0)
0x30010c
(8 bits)
D7–1 –
reserved
–
–
–
0 when being read.
D0
SSMCON
SSCG enable
1 Enable
0 Disable
0
R/W Write-protected
D[7:1]
Reserved
D0
SSMCON: SSCG Enable Bit
Turns the SSCG on or off.
1 (R/W): On
0 (R/W): Off (Default)
Setting this bit to 1 causes the SSCG to start operating. Setting this bit to 0 causes the SSCG to stop, al-
lowing the clock to bypasses the SSCG.
SSCG Macro Control Register 1 (CMU_SSCG1)
Register name Address
Bit
Name
Function
Setting
Init. R/W
Remarks
SSCG Macro
Control Register
1
(CMU_SSCG1)
0x30010d
(8 bits)
D7–4 SSMCITM
[3:0]
SSCG interval timer (ITM)
setting
0x0 to 0xf
X
R/W Write-protected
D3–0 SSMCIDT
[3:0]
SSCG maximum frequency
change width setting
0x0 to 0xf
X
R/W
Note: When the PLL is off, the initial values and the written values cannot be read correctly from this
register since the source clock is not supplied to the SSCG (different values are read out). The
correct values can be read out when the PLL is turned on.
D[7:4]
SSMCITM[3:0]: SSCG Interval Timer Setting Bits
Sets the frequency change cycle in SS modulation of the SSCG. (See Section 6.5, “SSCG.”)
Always set these bits to 0x1. (Default: undefined)
D[3:0]
SSMCIDT[3:0]: SSCG Maximum Frequency Change Width Setting Bits
Sets the maximum frequency change width in SS modulation of the SSCG. (See Section 6.5, “SSCG.”)