dsp56853 Freescale Semiconductor, Inc, dsp56853 Datasheet - Page 16

• Manufacturer Part Number: dsp56853
• Description: 16-bit Digital Signal Controllers
• Manufacturer: Freescale Semiconductor, Inc

16
Pin No.
Table 3-1. 56853 Signal and Package Information for the 128-pin LQFP (Continued)
103
104
105
Signal Name
GPIOB12
GPIOB13
GPIOB14
HREQ
HTRQ
HWR
HDS
HCS
Input/Output
Input/Output
Input/Output
Open Drain
Open Drain
Output
Output
Type
Input
Input
Input
56853 Technical Data, Rev. 6
Host Data Strobe (HDS)—When the HI08 is programmed to
interface to a single-data-strobe host bus and the HI function is
selected, this input enables a data transfer on the HI when HCS is
asserted.
These pins are disconnected internally.
Host Write Enable (HWR)—This signal is the Write Data input when
the HI08 is programmed to interface to a double-data-strobe host bus
and the HI function is selected.
Port B GPIO (12)—This pin is a General Purpose I/O (GPIO) pin
when not configured for host port usage.
Host Chip Select (HCS)—This input is the chip select input for the
Host Interface.
These pins are disconnected internally.
Port B GPIO (13)—This pin is a General Purpose I/O (GPIO) pin
when not configured for host port usage.
Host Request (HREQ)—When the HI08 is programmed for HRMS=0
functionality (typically used on a single-data-strobe bus), this open
drain output is used by the HI to request service from the host
processor. The HREQ may be connected to an interrupt request pin
of a host processor, a transfer request of a DMA controller, or a
control input of external circuitry.
These pins are disconnected internally.
Transmit Host Request (HTRQ)—This signal is the Transmit Host
Request output when the HI08 is programmed for HRMS=1
functionality and is typically used on a double-data-strobe bus.
Port B GPIO (14)—This pin is a General Purpose I/O (GPIO) pin
when not configured for host port usage.
Description
Freescale Semiconductor