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AM1705 Fiches technique(PDF) 50 Page - Texas Instruments

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No de pièce AM1705
Description  AM1705 ARM Microprocessor
Download  155 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

AM1705 Fiches technique(HTML) 50 Page - Texas Instruments

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AM1705
SPRS657A – FEBRUARY 2010 – REVISED APRIL 2010
www.ti.com
6.9
General-Purpose Input/Output (GPIO)
The GPIO peripheral provides general-purpose pins that can be configured as either inputs or outputs.
When configured as an output, a write to an internal register can control the state driven on the output pin.
When configured as an input, the state of the input is detectable by reading the state of an internal
register. In addition, the GPIO peripheral can produce CPU interrupts and EDMA events in different
interrupt/event generation modes. The GPIO peripheral provides generic connections to external devices.
The GPIO pins are grouped into banks of 16 pins per bank (i.e., bank 0 consists of GPIO [0:15]).
The device GPIO peripheral supports the following:
External Interrupt and DMA request Capability
Every GPIO pin may be configured to generate an interrupt request on detection of rising and/or
falling edges on the pin.
The interrupt requests within each bank are combined (logical or) to create eight unique bank level
interrupt requests.
The bank level interrupt service routine may poll the INTSTATx register for its bank to determine
which pin(s) have triggered the interrupt.
GPIO Banks 0, 1, 2, 3, 4, 5, 6, and 7 Interrupts assigned to ARM INTC Interrupt Requests 42, 43,
44, 45, 46, 47, 48, and 49 respectively
Additionally, GPIO Banks 0, 1, 2, 3, 4, and 5 Interrupts assigned to EDMA events 6, 7, 22, 23, 28,
and 29 respectively.
Set/clear functionality: Firmware writes 1 to corresponding bit position(s) to set or to clear GPIO
signal(s). This allows multiple firmware processes to toggle GPIO output signals without critical section
protection (disable interrupts, program GPIO, re-enable interrupts, to prevent context switching to
anther process during GPIO programming).
Separate Input/Output registers
Output register in addition to set/clear so that, if preferred by firmware, some GPIO output signals can
be toggled by direct write to the output register(s).
Output register, when read, reflects output drive status. This, in addition to the input register reflecting
pin status and open-drain I/O cell, allows wired logic be implemented.
The memory map for the GPIO registers is shown in Table 6-9.
50
Peripheral Information and Electrical Specifications
Copyright © 2010, Texas Instruments Incorporated
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