CY8C25122 Cypress Semiconductor, CY8C25122 Datasheet - Page 37
CY8C25122
Manufacturer Part Number
CY8C25122
Description
8-Bit Programmable System-on-Chip (PSoC) Microcontrollers
Manufacturer
Cypress Semiconductor
Datasheet
1.CY8C25122.pdf
(148 pages)
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Table 37:
1.
External Crystal Oscillator Trim Register (ECO_TR, Address = Bank 1, EBh)
7.1.4
Note : Use this equation if you do not employ PLL mode.
If you do employ PLL with the External Crystal Oscillator,
see Application Note
www.cypressmicro.com
error of 1 pF in C1 and C2 gives about 3 ppm error in fre-
quency.
September 5, 2002
Bit [7:6] : PSSDC [1:0] Power System Sleep Duty Cycle. (Not recommended for customer alteration)
0 0 = 1/128
0 1 = 1/512
1 0 = 1/32
1 1 = 1/8
Bit 5 : Reserved
Bit 4 : Reserved
Bit [3:2] : Amp [1:0] Sets the amplitude of the adjustment. (Not recommended for customer alteration)
Bit [1:0] : Bias [1:0] Sets the bias of the adjustment. (Not recommended for customer alteration)
Read/Write
Bit Name
Bit #
POR
FS = Factory set trim value
Crystal – 32.768 kHz watch crystal such as EPSON
C-002RX (12.5 pF load capacitance)
Capacitors – C1, C2
Use NPO-type ceramic caps
C1 = C2 = 25 pF - (Package Cap) - (Board Parasitic
Cap)
XtalIn
External Crystal Oscillator Trim Register
External Crystal Oscillator Component Connections and Selections
PSSDC [1] PSSDC [0]
FS
W
7
1
AN2027
for equation and details. An
Figure 8: External Crystal Oscillator Connections
FS
under Support at
W
6
1
Document #: 38-12010 CY Rev. ** CMS Rev. 3.20
V
c c
Reserved
C1
5
0
--
http://
Crys tal
Crys tal
Crys tal
Crys tal
Reserved
4
0
--
Table 38:
8 PDIP
20 PDIP
20 SOIC
20 SSOP
28 PDIP
28 SOIC
28 SSOP
44 TQFP
48 PDIP
48 SSOP
Package
Amp [1]
FS
W
3
1
Typical Package Capacitances
V
c c
C2
Amp [0]
Package Capacitance
FS
W
2
1
XtalOut
Bias [1]
FS
W
1
1
0.9 pF
0.5 pF
0.5 pF
0.5 pF
0.6 pF
2 pF
1 pF
2 pF
1 pF
5 pF
Bias [0]
FS
Clocking
W
0
1
37
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