dsp56852 Freescale Semiconductor, Inc, dsp56852 Datasheet - Page 13

• Manufacturer Part Number: dsp56852
• Description: 56800e 16-bit Digital Signal Controllers Digital Signal Controller
• Manufacturer: Freescale Semiconductor, Inc

Freescale Semiconductor
Table 3-1. 56852 Signal and Package Information for the 81-pin MAPBGA (Continued)
Pin No.
C4
C5
C2
A1
A6
A7
Signal Name
GPIOC4
GPIOC5
EXTAL
SRCK
SRFS
MISO
MOSI
XTAL
IRQA
IRQB
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Output (Z)
Input/
Type
Input
Input
Input
56852 Technical Data, Rev. 8
SPI Master In/Slave Out (MISO)—This serial data pin is an input to a
master device and an output from a slave device. The MISO line of a
slave device is placed in the high-impedance state if the slave device is
not selected.
Port C GPIO (4)—This pin is a General Purpose I/O (GPIO) pin that
can individually be programmed as input or output pin.
SSI Serial Receive Clock (SRCK)—This bidirectional pin provides the
serial bit rate clock for the receive section of the SSI. The clock signal
can be continuous or gated.
SPI Master Out/Slave In (MOSI)—This serial data pin is an output from
a master device and an input to a slave device. The master device
places data on the MOSI line a half-cycle before the clock edge that the
slave device uses to latch the data.
Port C GPIO (5)—This pin is a General Purpose I/O (GPIO) pin that
can individually be programmed as input or output pin.
SSI Serial Receive Frame Sync (SRFS)— This bidirectional pin is
used to count the number of words in a frame while receiving. A
programmable frame rate divider and a word length divider are used for
frame rate sync signal generation.
External Interrupt Request A (IRQA)—The IRQA Schmitt trigger input
is a synchronized external interrupt request that indicates that an
external device is requesting service. It can be programmed to be
level-sensitive or negative-edge- triggered.
External Interrupt Request B (IRQB)—The IRQB Schmitt trigger input
is an external interrupt request that indicates that an external device is
requesting service. It can be programmed to be level-sensitive or
negative-edge-triggered.
External Crystal Oscillator Input (EXTAL)—This input should be
connected to an external crystal. If an external clock source other than a
crystal oscillator is used, EXTAL must be tied off.
Crystal Oscillator Output (XTAL)—This output connects the internal
crystal oscillator output to an external crystal. If an external clock source
other than a crystal oscillator is used, XTAL must be used as the input.
Description
Introduction
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