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Device Overview
MFR4300 Data Sheet, Rev. 1
Freescale Semiconductor
39
2.4.3
Detailed Signal Descriptions
2.4.3.1
A[6:1]/XADDR[14:19] — AMI Address Bus, HCS12 Expanded Address
Inputs
A[6:1]/XADDR[14:19] are general purpose input pins. Their function is selected by the IF_SEL[1:0] pins.
Refer to
Section 2.7, “External Host Interface
” for more information. The pins can be configured to enable
or disable either pullup or pulldown resistors on the pins. (See
Section 4.3.1.5, “Host Interface Pins
Pullup/pulldown Enable Register (HIPPER)
” and
Section 4.3.1.6, “Host Interface Pins Pullup/pulldown
Control Register (HIPPCR)
”.)
A[6:1] are AMI interface address signals. A1 is the LSB of the AMI address bus.
XADDR[14:19] are HCS12 interface expanded address lines. XADDR14 is the LSB of the HCS12
interface expanded address lines.
2.4.3.2
A[9:7] — AMI Address Bus
A[9:7] are general purpose input pins. Their function is selected by the IF_SEL[1:0] pins. Refer to
Section 2.7, “External Host Interface
” for more information. The pins can be configured to enable or
disable either pullup or pulldown resistors on the pins.
A[9:7] are AMI interface address signals.
2.4.3.3
OE#/ACS[0] — AMI Read Output Enable, HCS12 Address Select Input
OE#/ACS0 is a general purpose input pin. Its function is selected by the IF_SEL[1:0] pins. Refer to
Section 2.7, “External Host Interface
” for more information. The pin can be configured to enable or
disable either a pullup or pulldown resistor on the pin.
OE# is the AMI interface output enable signal. This signal controls MFR4300 data output and the state of
three-stated data pins D[15:0] during host read operations.
ACS0 is an HCS12 interface address select signal.
2.4.3.4
A[12:11]/ACS[2:1] — AMI Address Bus, HCS12 Expanded Address Inputs
A[12:11]/ACS[2:1] are general purpose input pins. Their function is selected by the IF_SEL[1:0] pins.
Refer to
Section 2.7, “External Host Interface
” for more information. The pins can be configured to enable
or disable either pullup or pulldown resistors on the pins.
A[12:11] are AMI interface address signals.
ACS[1:2] are HCS12 interface address select signals.
2.4.3.5
BSEL[1:0]#/DBG[0:1] — AMI Byte Select, Debug Strobe Points
BSEL[1:0]/DBG[0:1] are general purpose input or output pins. Their function is selected by the
IF_SEL[1:0] pins. Refer to
Section 2.7, “External Host Interface
” for more information. The pins can be