Power, Ground and Peripheral Signals
MOTOROLA
Pin Descriptions
2-11
Preliminary
2
Table 2-5.
External Chip Select
Signal Name
Signal Type
853
Pins
854
Pins
855
Pins
857
Pins
858
Pins
CSO- CS3
(GPIOA0-A3)
Output
Input / Output
External Chip Select—These pins are used as
chip selects during external memory cycles.
Port A GPIO0-3—These are General Purpose I/O
pins when not configured for EMI use.
44
4
Table 2-6. Host Interface Eight
Signal Name
Signal Type
853
Pins
854
Pins
855
Pins
857
Pins
858
Pins
HD0-HD7
(GPIOB0-B7)
Input
Input / Output
Host Data—These inputs provide data for the HI
registers. These pins are disconnected internally
during reset.
Port B GPIO 0-7—These are a General Purpose
I/O pins when not configured for host port use.
88
—
88
HA0-HA2
(GPIOB8-B10)
Input
Input / Output
Host Address—These inputs provide address
selection for HI registers. These pins are
disconnected internally during reset.
Port B GPIO 10—These are General Purpose I/O
pins when not configured for host port use.
33
—
33
HRWB
(HRD)
(GPIOB11)
Input
Input
Input / Output
Host Read/Write—When the HI is programmed to
interface to a single-data-strobe host bus and the
HI function is selected, this signal is the
Read/Write input. These pins are disconnected
internally during reset.
Host Read Enable—This signal is the Read Data
input when the HI is programmed to interface to a
double-data-strobe host bus and the HI function is
selected.
Port B GPIO 11—This is a General Purpose I/O
pin when not configured for host port use.
11
—
11
HDS
(HRW)
(GPIOB12)
Input
Input
Input / Output
Host Data Strobe—When the HI 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.
Host Write Enable—This signal is the Write Data
input when the HI is programmed to interface to a
double-data-strobe host bus and the HI function is
selected.
Port B GPIO 12—This is a General Purpose I/O
pin when not configured for host port use.
11
—
11