MC68HC908AS60CFN Freescale Semiconductor, MC68HC908AS60CFN Datasheet - Page 371

• Manufacturer Part Number: MC68HC908AS60CFN
• Description: IC MCU 60K FLASH 8MHZ 52-PLCC
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908AS60CFN

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8.4MHz
• Connectivity: SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 40
• Program Memory Size: 60KB (60K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 15x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 52-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

MC68HC908AS60 — Rev. 1.0
NOTE:
Bits I0, I1, I2, and I3 are cleared by a read of the BSVR except when the
BDLC data register needs servicing (RDRF, RXIFR, or TDRE
conditions). RXIFR and RDRF can be cleared only by a read of the
BSVR followed by a read of the BDLC data register (BDR). TDRE can
either be cleared by a read of the BSVR followed by a write to the BDLC
BDR or by setting the TEOD bit in BCR2.
Upon receiving a BDLC interrupt, the user can read the value within the
BSVR, transferring it to the CPU’s index register. The value can then be
used to index into a jump table, with entries four bytes apart, to quickly
enter the appropriate service routine. For example:
The NOPs are used only to align the JMPs onto 4-byte boundaries so
that the value in the BSVR can be used intact. Each of the service
routines must end with a return-from-interrupt (RTI) instruction to
guarantee correct continued operation of the device. Note also that the
first entry can be omitted since it corresponds to no interrupt occurring.
The service routines should clear all of the sources that are causing the
pending interrupts. Note that the clearing of a high priority interrupt may
still leave a lower priority interrupt pending, in which case bits I0, I1, and
I2 of the BSVR will then reflect the source of the remaining interrupt
request.
If fewer states are used or if a different software approach is taken, the
jump table can be made smaller or omitted altogether.
Service
*
*
JMPTAB
*
Freescale Semiconductor, Inc.
For More Information On This Product,
Byte Data Link Controller-Digital (BDLC-D)
Go to: www.freescale.com
LDX
JMP
JMP
NOP
JMP
NOP
JMP
NOP
JMP
END
BSVR
JMPTAB,X
SERVE0
SERVE1
SERVE2
SERVE8
Fetch State Vector Number
Enter service routine,
(must end in RTI)
Service condition #0
Service condition #1
Service condition #2
Service condition #8
Byte Data Link Controller-Digital (BDLC-D)
BDLC CPU Interface
Technical Data