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CY7C68015A-56LFXC Datasheet(PDF) 7 Page - Cypress Semiconductor

Part # CY7C68015A-56LFXC
Description  EZ-USB FX2LP??USB Microcontroller High Speed USB Peripheral Controller
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CY7C68015A-56LFXC Datasheet(HTML) 7 Page - Cypress Semiconductor

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CY7C68013A, CY7C68014A
CY7C68015A, CY7C68016A
Document #: 38-08032 Rev. *M
Page 7 of 62
3.9.2 Wakeup Pins
The 8051 puts itself and the rest of the chip into a power down
mode by setting PCON.0 = 1. This stops the oscillator and PLL.
When WAKEUP is asserted by external logic the oscillator
restarts after the PLL stabilizes, and the 8051 receives a wakeup
interrupt. This applies whether or not FX2LP is connected to the
USB.
The FX2LP exits the power down (USB suspend) state using one
of the following methods:
USB bus activity (if D+/D– lines are left floating, noise on these
lines may indicate activity to the FX2LP and initiate a wakeup)
External logic asserts the WAKEUP pin
External logic asserts the PA3/WU2 pin
The second wakeup pin, WU2, can also be configured as a
general purpose I/O pin. This enables a simple external R-C
network to be used as a periodic wakeup source. WAKEUP is by
default active LOW.
3.10 Program/Data RAM
3.10.1 Size
The FX2LP has 16 KBytes of internal program/data RAM, where
PSEN#/RD# signals are internally ORed to enable the 8051 to
access it as both program and data memory. No USB control
registers appear in this space.
Two memory maps are shown in the following diagrams:
Figure 3 on page 8 shows the Internal Code Memory, EA = 0
Figure 4 on page 9 shows the External Code Memory, EA = 1.
3.10.2 Internal Code Memory, EA = 0
This mode implements the internal 16 KByte block of RAM
(starting at 0) as combined code and data memory. When
external RAM or ROM is added, the external read and write
strobes are suppressed for memory spaces that exist inside the
chip. This enables the user to connect a 64 KByte memory
without requiring address decodes to keep clear of internal
memory spaces.
Only the internal 16 KBytes and scratch pad 0.5 KBytes RAM
spaces have the following access:
USB download
USB upload
Setup data pointer
I2C interface boot load.
3.10.3 External Code Memory, EA = 1
The bottom 16 KBytes of program memory is external and
therefore the bottom 16 KBytes of internal RAM is accessible
only as a data memory.
Figure 2. Reset Timing Plots
VIL
0V
3.3V
3.0V
TRESET
VCC
RESET#
Power on Reset
TRESET
VCC
RESET#
VIL
Powered Reset
3.3V
0V
Table 5. Reset Timing Values
Condition
TRESET
Power on Reset with Crystal
5 ms
Power on Reset with External
Clock
200
μs + Clock stability time
Powered Reset
200
μs
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