stlc1511 STMicroelectronics, stlc1511 Datasheet - Page 24

• Manufacturer Part Number: stlc1511
• Description: Northenlite?? G.lite Bicmos Analog Front-end Circuit
• Manufacturer: STMicroelectronics

STLC1511
Table 13. Detailed Register Map: AFE Control 5
24/31
Title:
Label:
Address:
Description:
Clock Source Control
OSC Mode
PLL Mode
FREF Mode
DIGREF Enable
reserved
<1>Presently there is no difference in the oscillator driver between CO Oscillator and CPE modes so this bit is unused. However, it
<2>For FREF at 2.56MHz (b5:b4 = “00”), the compare frequency for the PLL is at 1.28MHz. For all other FREF modes the compare
Bit Label
may be required in the future and should be programmed correctly in case needed.
frequency is at 512kHz.
1
2
PLL Control Register
AFE Control 5 (PLL Control)
PLL Control
100
b0-b1
b2
b3
b5-b4
b6
b7
Bit(s)
00
01
10
11
0
1
0
1
00
01
10
11
0
1
Value
(CO External Clock Mode.) Output of
clock selection MUX is from FREF pin.
oscillator driver.
(CO Oscillator Mode.) Output of clock
selection MUX is from output of divide by
5.
(CPE Mode). Output of clock selection
MUX is from output of oscillator driver.
(Other CPE Mode). Output of clock
selection MUX is from output of oscillator
driver.
(CO Oscillator mode.) AFE is configured
to drive external 88.32MHz LC oscillator.
(CPE mode.) AFE is configured to drive
external 35.328MHz crystal oscillator.
PLL active (PFD,CP active)
PLL Inactive (PFD,CP powered down)
FREF frequency is 2.56MHz
FREF frequency is 1.536MHz
FREF frequency is 2.048MHz
FREF frequency is 4.096MHz
DIGREF Output pin tristated
DIGREF Output pin active
This state also powers down the PLL and
Bit Description
Access Type:
Bits Used:
R/W
7
00
1
0
00
1
0
Reset