MC68HC908QY2 MOTOROLA [Motorola, Inc], MC68HC908QY2 Datasheet - Page 120

• Manufacturer Part Number: MC68HC908QY2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Monitor ROM (MON)
9.4.2 V
120
MC68HC908QY4•MC68HC908QT4•MC68HC908QY2•MC68HC908QT2•MC68HC908QY1•MC68HC908QT1
TST
Monitor Mode
NOTE:
The BIH and BIL instructions will behave as if the IRQ pin is enabled,
regardless of the settings in the configuration register. See
Configuration Register
The COP module is disabled in forced monitor mode. Any reset other
than a power-on reset (POR) will automatically force the MCU to come
back to the forced monitor mode.
In monitor mode, the MCU uses different vectors for reset, SWI
(software interrupt), and break interrupt than those for user mode. The
alternate vectors are in the $FE page instead of the $FF page and allow
code execution from the internal monitor firmware instead of user code.
Exiting monitor mode after it has been initiated by having a blank reset
vector requires a power-on reset (POR). Pulling RST (when RST pin
available) low will not exit monitor mode in this situation.
Table 9-2
mode regarding vectors.
RST and OSC1 functions will be active on the PTA3 and PTA5 pins
respectively as long as V
lowered (no longer V
mode, but the pin functions will be determined by the settings in the
configuration registers (see
(CONFIG)) when V
function as a port input pin in monitor mode. Bit 2 of the Port A data
register will always read 0. The BIH and BIL instructions will behave as
if the IRQ pin is enabled, regardless of the settings in the configuration
registers.
User
Monitor
Modes
summarizes the differences between user mode and monitor
Vector
$FFFE
$FEFE
Reset
High
Monitor ROM (MON)
TST
TST
Table 9-2. Mode Difference
Vector
$FFFF
$FEFF
was lowered, except for the IRQ pin. IRQ will not
Reset
Low
) then the chip will still be operating in monitor
TST
(CONFIG).
Section 5. Configuration Register
is applied to IRQ pin. If the IRQ pin is
Vector
$FFFC
$FEFC
Break
High
Functions
$FEFD
Vector
$FFFD
Break
Low
$FEFC
Vector
$FFFC
High
SWI
Section 5.
MOTOROLA
Vector
$FFFD
$FEFD
SWI
Low