MC68HC908GR8CP Freescale Semiconductor, MC68HC908GR8CP Datasheet - Page 197

• Manufacturer Part Number: MC68HC908GR8CP
• Description: IC MCU FLASH 8BIT 8MHZ 4K 28-DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908GR8CP

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 17
• Program Memory Size: 7.5KB (7.5K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 6x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

15.4.4 Baud Rate
15.4.5 Commands
MC68HC908GR8 — Rev 4.0
MOTOROLA
The communication baud rate is controlled by the crystal frequency upon
entry into monitor mode. The divide by ratio is 1024.
If monitor mode was entered with V
also set at 1024. If monitor mode was entered with V
internal PLL steps up the external frequency, presumed to be 32.768
kHz, to 2.4576 MHz. These latter two conditions for monitor mode entry
require that the reset vector is blank.
Table 15-3
baud rate of 9600 BPS. Other standard baud rates can be accomplished
using proportionally higher or lower frequency generators. If using a
crystal as the clock source, be aware of the upper frequency limit that the
internal clock module can handle. See
Control Timing
The monitor ROM firmware uses these commands:
Freescale Semiconductor, Inc.
•
•
•
•
•
•
For More Information On This Product,
READ (read memory)
WRITE (write memory)
IREAD (indexed read)
IWRITE (indexed write)
READSP (read stack pointer)
RUN (run user program)
9.8304 MHz
9.8304 MHz
Frequency
32.768 kHz
External
lists external frequencies required to achieve a standard
Go to: www.freescale.com
Table 15-3. Monitor Baud Rate Selection
Monitor ROM (MON)
for this limit.
V
IRQ
V
V
TST
DD
SS
DD
2.4576 MHz
2.4576 MHz
2.4576 MHz
Frequency
Internal
on IRQ, then the divide by ratio is
5.0 V Control Timing
SS
Functional Description
Baud Rate
Monitor ROM (MON)
on IRQ, then the
(BPS)
9600
9600
9600
Technical Data
and
3.0 V
197