AN2136SC Cypress Semiconductor Corp, AN2136SC Datasheet - Page 180
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AN2136SC
Manufacturer Part Number
AN2136SC
Description
IC MCU 8051 8K RAM 24MHZ 44QFP
Manufacturer
Cypress Semiconductor Corp
Series
EZ-USB®r
Datasheet
1.AN2131SC.pdf
(334 pages)
Specifications of AN2136SC
Applications
USB Microcontroller
Core Processor
8051
Program Memory Type
ROMless
Controller Series
AN213x
Ram Size
8K x 8
Interface
I²C, USB
Number Of I /o
8
Voltage - Supply
3 V ~ 3.6 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
44-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
428-1309
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The EZ-USB chip has three resets:
This chapter describes the effects of these three resets.
When power is first applied to the EZ-USB chip, the external R-C circuit holds the EZ-
USB core in reset until the on-chip PLL stabilizes. The CLK24 pin is active as soon as
power is applied. The 8051 may clear an EZ-USB control bit, CLK24OE, to inhibit the
CLK24 output pin for EMI-sensitive applications that do not need this signal. External
logic can force a chip reset by pulling the RESET pin HI. The RESET pin is normally
EZ-USB TRM v1.9
10.1
10.2
•
•
•
A Power-On Reset (POR), which turns on the EZ-USB chip in a known state.
An 8051 reset, controlled by the EZ-USB core.
A USB bus reset, sent by the host to reset a device.
Introduction
EZ-USB Power-On Reset (POR)
MHz
12
Vcc
XOUT
RESET
XIN
10 EZ-USB Resets
Figure 10-1. EZ-USB Resets
Chapter 10. EZ-USB Resets
Oscillator
RES
USB Bus
Reset
EZ-USB Core
(1 at PWR ON)
PLL
CPUCS.0
48 MHz
RES
8051
÷2
24 MHz
CLK24
Page 10-1
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