MC68HC12 MOTOROLA [Motorola, Inc], MC68HC12 Datasheet - Page 146
MC68HC12
Manufacturer Part Number
MC68HC12
Description
The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC12.pdf
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Resets and Interrupts
10.9.3 Interrupts
10.9.4 Parallel I/O
10.9.5 Central Processing Unit
10.9.6 Memory
Technical Data
146
PSEL is initialized in the HPRIO register with the value $F2, causing the
external IRQ pin to have the highest I-bit interrupt priority. The IRQ pin
is configured for level-sensitive operation (for wired-OR systems).
However, the interrupt mask bits in the CPU12 CCR are set to mask X-
and I-related interrupt requests.
If the MCU comes out of reset in a single-chip mode, all ports are
configured as general-purpose high-impedance inputs.
If the MCU comes out of reset in an expanded mode, port A and port B
are used for the address/data bus, and port E pins are normally used to
control the external bus (operation of port E pins can be affected by the
PEAR register). Out of reset, port J, port H, port K, port IB, port P, port
S, port T, port AD0 and port AD1 are all configured as general-purpose
inputs.
After reset, the CPU fetches a vector from the appropriate address, then
begins executing instructions. The stack pointer and other CPU registers
are indeterminate immediately after reset. The CCR X and I interrupt
mask bits are set to mask any interrupt requests. The S bit is also set to
inhibit the STOP instruction.
After reset, the internal register block is located from $0000 to $03FF,
RAM is at $2000 to $3FFF, and EEPROM is located at $0800 to $0FFF.
In single chip mode one 32-Kbyte FLASH EEPROM module is located
from $4000 to $7FFF and $C000 to $FFFF, and the other three 32-Kbyte
FLASH EEPROM modules are accessible through the program page
window located from $8000 to $BFFF. The first 32-Kbyte FLASH
EEPROM is also accessible through the program page window.
Resets and Interrupts
MC68HC912DT128A — Rev 4.0
MOTOROLA
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