MC68HC908GR16CFJ Freescale Semiconductor, MC68HC908GR16CFJ Datasheet - Page 247

• Manufacturer Part Number: MC68HC908GR16CFJ
• Description: IC MCU 16K FLASH 8MHZ SPI 32LQFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908GR16CFJ

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: LIN, SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 21
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

This condition states that as long as V
V
then the COP will be disabled. In the latter situation, after V
removed from the IRQ pin in the interest of freeing the IRQ for normal functionality in monitor mode.
19.3.1.2 Forced Monitor Mode
If entering monitor mode without high voltage on IRQ, then all port B pin requirements and conditions,
including the PTB4 frequency divisor selection, are not in effect. This is to reduce circuit requirements
when performing in-circuit programming.
An external oscillator of 9.8304 MHz is required for a baud rate of 9600, as the internal bus frequency is
automatically set to the external frequency divided by four.
When the forced monitor mode is entered the COP is always disabled regardless of the state of IRQ or
RST.
19.3.1.3 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 19-2
19.3.1.4 Data Format
Communication with the monitor ROM is in standard non-return-to-zero (NRZ) mark/space data format.
Transmit and receive baud rates must be identical.
Freescale Semiconductor
TST
is applied to RST after the initial reset to get into monitor mode (when V
summarizes the differences between user mode and monitor mode.
User
Monitor
Modes
Once the reset vector has been programmed, the traditional method of
applying a voltage, V
START
BIT
Vector High
$FFFE
$FEFE
Reset
BIT 0
BIT 1
Vector Low
Figure 19-13. Monitor Data Format
$FFFF
$FEFF
Reset
MC68HC908GR16 Data Sheet, Rev. 5.0
TST
BIT 2
Table 19-2. Mode Differences
TST
, to IRQ must be used to enter monitor mode.
is maintained on the IRQ pin after entering monitor mode, or if
BIT 3
Vector High
$FEFC
$FFFC
Break
BIT 4
NOTE
Functions
BIT 5
Vector Low
TST
$FFFD
$FEFD
Break
BIT 6
is applied to the RST pin, V
BIT 7
Vector High
$FEFC
$FFFC
STOP
SWI
BIT
TST
START
NEXT
BIT
was applied to IRQ),
Vector Low
$FFFD
$FEFD
SWI
Monitor ROM (MON)
TST
can be
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