486
CY8C28xxx PSoC Programmable System-on-Chip TRM, Document No. 001-52594 Rev. *G
Decimator
The clocks are generated as shown in
. Note that there is an exception on clock generation: When ACCx_CMPO
is the data input, the decimator's clocks are directly derived from the ACCx block; that is, the clock generator is bypassed. The
final clocks are all zeros when the DECx_EN is zero, regardless of the clock source setting. The generator is reset when
CLK_INx[2:0] or DSCLK[3:0] or the configure bits of ACE_CLKA0 and ACE_CLKA1 are written; that is, the writing action syn-
chronizes the generated clocks.
Note
The input clock to the decimator must be less than 24 MHz.The decimator will not function properly at 24M Hz.
Figure 27-5. Decimator Clock Generation
shows how the clock is selected.
A preselected FO (digital row primary output) is shared
between all decimator rows. The DSCLK[3:0] in DEC_CR5
indicates which FO is selected.
27.1.1.2
Single External Decimation Clock
Supports Four Decimators
The configuration bits of DCLKS[3:0] in the DEC_CR0 and
DEC_CR1 registers select 1 out of 12 digital block outputs to
generate decimation clock DCLK as shown in
.
This setting is ignored when the Decimation Rate is set in
DECx_CR.
Figure 27-6.
27.1.1.3
Single Incremental Gating Clock
Supports Six Analog Compare
Outputs
The bits of ICLKS[3:0] in DEC_CR0 and DEC_CR1 select 1
out of 16 digital block outputs to form gating signal. The gat-
ing signal, as well as 6 incremental gating enable signals, is
sent to each ACC column and ACE column to gate the ana-
log columns' compare output, as shown in
.
Figure 27-7.
Note that to remain compatible with old PSoC1 chips, the
gating circuit is before the LUT in ACC column and is after
LUT in ACE column.
Refer to the
and the
Note also that the ICLKS and DCLKS selections are com-
patible with the CY8C25/26xxx PSoC devices.
DIV
2
DIV
4
DIV4
SYSCLK
PD_
SCLK
VC1
VC2
CLK
DIV2
CLK_INx[2:0]
ACE_A0
DSCLK[3:0]
DECx Clock Gen
FO1[15:0]
PHI2
ACE_A1
VC3
SYSCLK
CLKIN
Table 27-4. Clock Selection
CLK_INx[2:0]
CLKIN
CLK_INx[2:0]
CLKIN
000b
VC1
100b
VC3
001b
VC2
101b
Preselected digital
block output
010b
ACE_CLKA0
110b
SYSCLK
011b
ACE_CLKA1
111b
Reserved
FO[15:0]
DCLKS[3:0]
IDEC
DCLKIN
CLK24
RESET
RESET
DCLK
FO[15:0]
ICLKS[3:0]
DEC_GATE
*_IGEN
Analog output
Gated analog
column output
In Each ACC/ACE Column
Содержание CY8C28 series
Страница 65: ...64 CY8C28xxx PSoC Programmable System on Chip TRM Document No 001 52594 Rev G RAM Paging ...
Страница 85: ...84 CY8C28xxx PSoC Programmable System on Chip TRM Document No 001 52594 Rev G Internal Main Oscillator IMO ...
Страница 93: ...92 CY8C28xxx PSoC Programmable System on Chip TRM Document No 001 52594 Rev G External Crystal Oscillator ECO ...
Страница 97: ...96 CY8C28xxx PSoC Programmable System on Chip TRM Document No 001 52594 Rev G Phase Locked Loop PLL ...
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Страница 311: ...310 CY8C28xxx PSoC Programmable System on Chip TRM Document No 001 52594 Rev G IDAC_CR0 1 FDh ...
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Страница 425: ...424 CY8C28xxx PSoC Programmable System on Chip TRM Document No 001 52594 Rev G Analog Reference ...
Страница 461: ...460 CY8C28xxx PSoC Programmable System on Chip TRM Document No 001 52594 Rev G Two Column Limited Analog System ...
Страница 477: ...476 CY8C28xxx PSoC Programmable System on Chip TRM Document No 001 52594 Rev G Digital Clocks ...
Страница 483: ...482 CY8C28xxx PSoC Programmable System on Chip TRM Document No 001 52594 Rev G Multiply Accumulate MAC ...
Страница 513: ...512 CY8C28xxx PSoC Programmable System on Chip TRM Document No 001 52594 Rev G Internal Voltage Reference ...
Страница 523: ...522 CY8C28xxx PSoC Programmable System on Chip TRM Document No 001 52594 Rev G Switch Mode Pump SMP ...
Страница 533: ...532 CY8C28xxx PSoC Programmable System on Chip TRM Document No 001 52594 Rev G I O Analog Multiplexer ...
Страница 537: ...536 CY8C28xxx PSoC Programmable System on Chip TRM Document No 001 52594 Rev G Real Time Clock RTC ...
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