Device Overview
MFR4300 Data Sheet, Rev. 1
40
Freescale Semiconductor
configured to provide either high or reduced output drive, and also to enable or disable either pullup or
pulldown resistors on the pins.
BSEL[1:0]# are AMI byte select signals.
DBG[0:1] are debug strobe point output signals. The functions output on these pins are selected by the
debug port control register. Refer to
Section 3.4.16, “Strobe Signal Support
” for more information.
2.4.3.6
D[15:8]/PB[0:7] — AMI Data Bus, HCS12 Multiplexed Address/Data Bus
D[15:8]/PB[0:7] are general purpose input or output pins. Their functions are selected by the IF_SEL[1:0]
pins. Refer to
Section 2.7, “External Host Interface
” for more information. These pins can be configured
to provide either high or reduced output drive, and also to enable or disable either pullup or pulldown
resistors on the pins.
D[15:8] are data signals of the AMI interface. D15 is the MSB of the AMI data bus.
PB[0:7] are HCS12 interface multiplexed address/data signals in the HCS12 Host interface mode of
operation. PB0 is the LSB of the HCS12 address/data bus.
2.4.3.7
D[7:0]/PA[0:7] — AMI Data Bus, HCS12 Multiplexed Address/Data Bus
D[7:0]/PA[0:7] are general purpose input or output pins. Their functions are selected by the IF_SEL[1:0]
pins. Refer to
Section 2.7, “External Host Interface
” for more information. These pins can be configured
to provide either high or reduced output drive, and also to enable or disable either pullup or pulldown
resistors on the pins.
D[7:0] are data signals of the AMI interface. D0 is the LSB of the AMI data bus.
PA[0:7] are HCS12 interface multiplexed address/data signals in the HCS12 Host interface mode of
operation. PA7 is the MSB of the HCS12 address/data bus.
2.4.3.8
CE#/LSTRB — AMI Chip Select, HCS12 Low-byte Strobe
The function of this pin is selected by IF_SEL[1:0] pins. Refer
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.
CE# is an AMI interface transfer size input signal. It indicates the size of the requested data transfer in the
current bus cycle.
LSTRB is an HCS12 interface low-byte strobe input signal. It indicates the type of bus access.
2.4.3.9
WE#/RW_CC# — AMI Write Enable, HCS12 Read/Write Select
The function of this pin 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.
WE# is an AMI interface write select signal. It strobes the valid data provided by the host on the D[15:0]
pins during write operations to the MFR4300 memory.