Datasheet

Pinout and Signal Descriptions
Signal Descriptions
MC68HC912DT128A — Rev 4.0 Technical Data
MOTOROLA Pinout and Signal Descriptions 55
IRQ PE1 55
Maskable interrupt request input provides a means of applying asynchronous
interrupt requests to the MCU. Either falling edge-sensitive triggering or level-
sensitive triggering is program selectable (INTCR register).
XIRQ PE0 56
Provides a means of requesting asynchronous nonmaskable interrupt requests
after reset initialization
SMODN/
BKGD/
TAG H I
-23
During reset, this pin determines special or normal operating mode. After reset,
single-wire background interface pin is dedicated to the background debug
function. Pin function TAGHI
used in instruction tagging. See Development
Support.
IX[2:0] PK[2:0] 109-111 Page Index register emulation outputs.
ECS PK7 108 Emulation Chip select.
PW[3:0] PP[3:0] 112, 1–3 Pulse Width Modulator channel outputs.
SS PS7 96 Slave select output for SPI master mode, input for slave mode or master mode.
SCK PS6 95 Serial clock for SPI system.
SDO/MOSI PS5 94 Master out/slave in pin for serial peripheral interface
SDI/MISO PS4 93 Master in/slave out pin for serial peripheral interface
TxD1 PS3 92 SCI1 transmit pin
RxD1 PS2 91 SCI1 receive pin
TxD0 PS1 90 SCI0 transmit pin
RxD0 PS0 89 SCI0 receive pin
IOC[7:0] PT[7:0]
18–15,
7–4
Pins used for input capture and output compare in the timer and pulse
accumulator subsystem.
AN1[7:0] PAD1[7:0]
84/82/80/
78/76/74/
72/70
Analog inputs for the analog-to-digital conversion module 1
AN0[7:0] PAD0[7:0]
83/81/79/
77/75/73/
71/69
Analog inputs for the analog-to-digital conversion module 0
TEST - 97
Used for factory test purposes. Do not connect in the application; may be
bonded to 5.5 V max.
TxCAN2
(1)
-100
MSCAN2 transmit pin (MC68HC912DT128A only). Leave unconnected if
MSCAN2 is not used.
RxCAN2
(1)
-101
MSCAN2 receive pin (MC68HC912DT128A only). Pin has internal pull-up;
where msCAN module is not used, do not tie to VSS.
TxCAN1 - 102 MSCAN1 transmit pin. Leave unconnected if MSCAN1 is not used.
RxCAN1 - 103
MSCAN1 receive pin. Pin has internal pull-up; where msCAN module is not
used, do not tie to VSS.
TxCAN0 - 104 MSCAN0 transmit pin. Leave unconnected if MSCAN0 is not used.
RxCAN0 - 105
MSCAN0 receive pin. Pin has internal pull-up; where msCAN module is not
used, do not tie to VSS.
SCL PIB7 98
I
2
C bus serial clock line pin
Table 3-2. MC68HC912DT128A Signal Description Summary
Pin Name
Shared
port
Pin
Number
Description
112-pin
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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