參數(shù)資料
型號(hào): USB2232-NU-03
廠商: SMSC Corporation
英文描述: 5th GENERATION HI-SPEED USB FLASH MEDIA AND CIR CONTROLLER WITH INTEGRATED CARD POWER FETs
中文描述: 第五代高速USB閃存介質(zhì)和CIR控制器,它集成卡功率場(chǎng)效應(yīng)管
文件頁(yè)數(shù): 19/26頁(yè)
文件大?。?/td> 937K
代理商: USB2232-NU-03
5th Generation Hi-Speed USB Flash Media and CIR Controller with Integrated Card Power FETs
Datasheet
SMSC USB2231/USB2232
19
Revision 1.3 (07-12-05)
DATASHEET
GPIO6, ROMEN,
Memory Address 16
GPIO6/ROMEN
/MA16
IPU
This pin has an internal weak pull-up resistor that is
enabled or disabled by the state of nRESET.
The pull-up is enabled when nRESET is active.
The pull-up is disabled, when the nRESET is inactive
(some clock cycles later, after the rising edge of
nRESET).
The state of this pin is latched internally on the rising
edge of nRESET to determine if internal or external
program memory is used.
The state latched is stored in ROMEN bit of GPIO_IN1
register.
I/O8
After the rising edge of nRESET, this pin may be used
as GPIO6 or RXD.
When pulled low via an external weak pull-down
resistor, an external program memory should be
connected to the memory data bus. The
USB2231/USB2232 uses this external bus for program
execution.
When this pin is left unconnected or pulled high by a
weak pull-up resistor, the USB2231/USB2232 uses the
internal ROM for program execution.
I/O8
For Bank Switching support, MA16 addresses the
external 128k memory above the standard 64k range
(the upper 64k is mapped into the 64k addressable
ROM space)
General Purpose
I/O
GPIO7
I/O8
This pin may be used either as input, edge sensitive
interrupt input, or output.
General Purpose
I/O
Or
Card Power
GPIO8/
CRD_PWR0
I/O8
GPIO: This pin may be used either as input, edge
sensitive interrupt input, or output.
CRD_PWR: Card Power drive of 3.3V @ 100mA.
General Purpose
I/O
GPIO9
I/O8
This pin may be used either as input, edge sensitive
interrupt input, or output.
General Purpose
I/O
Or
Card Power
GPIO10/
CRD_PWR1
I/O8
GPIO: This pin may be used either as input, edge
sensitive interrupt input, or output.
CRD_PWR: Card Power drive of 3.3V @ 100mA.
General Purpose
I/O
Or
Card Power
GPIO11/
CRD_PWR2
I/O8
GPIO: This pin may be used either as input, edge
sensitive interrupt input, or output.
CRD_PWR: Card Power drive of 3.3V @ 200mA.
General Purpose
I/O
GPIO12
I/O8
These pins may be used either as input, or output.
RESET input
nRESET
IS
This active low signal is used by the system to reset the
chip. The active low pulse should be at least 1
μ
s wide.
TEST Input
nTEST[1:0]
I
These signals are used for testing the chip. User should
normally tie them high externally, if the test function is
not used.
Table 6.1 USB2231/USB2232 Pin Descriptions
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
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