MC908QY4ACDWE Freescale Semiconductor, MC908QY4ACDWE Datasheet - Page 149

• Manufacturer Part Number: MC908QY4ACDWE
• Description: IC MCU 8BIT 4K FLASH 16-SOIC
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC908QY4ACDWE

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Peripherals: LVD, POR, PWM
• Number Of I /o: 13
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Processor Series: HC08QY
• Core: HC08
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 13
• Number Of Timers: 2
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: FSICEBASE, M68CBL05AE, DEMO908QB8, DEMO908QC16
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 6 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Connectivity: -
• Lead Free Status / Rohs Status: Details

If monitor mode was entered as a result of the reset vector being blank, the COP is always disabled
regardless of the state of IRQ.
If the voltage applied to the IRQ is less than V
circuitry monitors the reset vector fetches and will assert an internal reset if it detects that the reset vectors
are erased ($FF). When the MCU comes out of reset, it is forced into monitor mode without requiring high
voltage on the IRQ pin. Once out of reset, the monitor code is initially executing with the internal clock at
its default frequency.
If IRQ is held high, all pins will default to regular input port functions except for PTA0 and PTA5 which will
operate as a serial communication port and OSC1 input respectively (refer to
allow the clock to be driven from an external source through OSC1 pin.
If IRQ is held low, all pins will default to regular input port function except for PTA0 which will operate as
serial communication port. Refer to
Regardless of the state of the IRQ pin, it will not 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 register. See
(CONFIG).
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.
15.3.1.3 Monitor Vectors
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.
Table 15-2
Freescale Semiconductor
User
Monitor
Modes
summarizes the differences between user mode and monitor mode regarding vectors.
If the reset vector is blank and monitor mode is entered, the chip will see an
additional reset cycle after the initial power-on reset (POR). Once the reset
vector has been programmed, the traditional method of applying a voltage,
V
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.
TST
, to IRQ must be used to enter monitor mode.
Vector High
$FFFE
$FEFE
Reset
MC68HC908QYA/QTA Family Data Sheet, Rev. 3
Vector Low
Figure
Table 15-2. Mode Difference
$FEFF
$FFFF
Reset
15-12.
TST
Vector High
NOTE
NOTE
, the MCU will come out of reset in user mode. Internal
$FFFC
$FEFC
Break
Functions
Vector Low
$FEFD
$FFFD
Break
Chapter 5 Configuration Register
Vector High
$FFFC
$FEFC
SWI
Figure
Monitor Module (MON)
Vector Low
15-11). That will
$FFFD
$FEFD
SWI
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