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USB2229 数据表(PDF) 15 Page - Microchip Technology

部件名 USB2229
功能描述  5th Generation Hi-Speed USB Flash Media and IrDA Controller with Integrated Card Power FETs
PDF  28 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

USB2229 数据表(HTML) 15 Page - Microchip Technology

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 2005-2016 Microchip Technology Inc.
DS00002252A-page 15
USB2229/USB2230
Memory Address Bus MA[1:0]/CLK_SE
L[1:0]
I/O8PD
MA[1:0], These signals address memory locations within
the external memory.
SEL[1:0]. During nRESET assertion, these pins will select
the operating frequency of the external clock, and the
corresponding weak pull-down resistors are enabled.
When nRESET is negated, the value on these pins will
be internal latched and these pins will revert to MA[1:0]
functionality, the internal pull-downs will be disabled.
SEL[1:0] = ‘00’. 24MHz
SEL[1:0] = ‘01’. RESERVED
SEL[1:0] = ‘10’. RESERVED
SEL[1:0] = ‘11’. 48MHz
Note:
If the latched value is ‘1’, then the correspond-
ing MA pin is tri-stated when the following con-
ditions are true:
1. IDLE bit (PCON.0) is 1.
2. INT2 is negated
3. SLEEP bit of CLOCK_SEL is 1.
If the latched value is ‘0’, then the corresponding MA pin
will function identically to the MA[15:3] pins at all times
(other than during nRESET assertion).
Memory Write Strobe
nMWR
O8
Program Memory Write; active low
Memory Read Strobe
nMRD
O8
Program Memory Read; active low
Memory Chip Enable
nMCE
O8
Program Memory Chip Enable; active low.
This signal is asserted, when any of the following
conditions are no longer met:
1. IDLE bit (PCON.0) is 1.
2. INT2 is negated
3. SLEEP bit of CLOCK_SEL is 1.
Note:
This signal is held to a logic ‘high’ while nRE-
SET is asserted.
MISC
General Purpose I/O
GPIO1
I/O8
This pin may be used either as input, edge sensitive
interrupt input, or output.
General Purpose I/O
GPIO2
I/O8
This pin may be used either as input, edge sensitive
interrupt input, or output.
General Purpose I/O
GPIO3
I/O8
This pin may be used either as input, edge sensitive
interrupt input, or output.
General Purpose I/O
GPIO4
I/O8
This pin may be used either as input, edge sensitive
interrupt input, or output.
General Purpose I/O
GPIO5
I/O8
This pin may be used either as input, edge sensitive
interrupt input, or output.
TABLE 5-1:
USB2229/USB2230 PIN DESCRIPTIONS (CONTINUED)
Name
Symbol
Buffer Type
Description



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