MC68376BAMFT20 Freescale Semiconductor, MC68376BAMFT20 Datasheet - Page 74

• Manufacturer Part Number: MC68376BAMFT20
• Manufacturer: Freescale Semiconductor

Specifications of MC68376BAMFT20

• Cpu Family: 68K/M683xx
• Device Core: ColdFire
• Device Core Size: 32b
• Frequency (max): 20MHz
• Interface Type: QSPI/SCI
• Program Memory Type: ROM
• Program Memory Size: 8KB
• Total Internal Ram Size: 7.5KB
• # I/os (max): 18
• Number Of Timers - General Purpose: 2
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.25V
• Operating Supply Voltage (min): 4.75V
• On-chip Adc: 16-chx10-bit
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 160
• Package Type: PQFP
• Lead Free Status / Rohs Status: Not Compliant

4.10.7 Background Mode Registers
4.10.7.1 Fault Address Register (FAR)
4.10.7.2 Return Program Counter (RPC)
4-22
MOTOROLA
BDM processing uses three special purpose registers to keep track of program context
during development. A description of each follows.
The FAR contains the address of the faulting bus cycle immediately following a bus or
address error. This address remains available until overwritten by a subsequent bus
cycle. Following a double bus fault, the FAR contains the address of the last bus cycle.
The address of the first fault (if there was one) is not visible to the user.
The RPC points to the location where fetching will commence after transition from
background mode to normal mode. This register should be accessed to change the
flow of a program under development. Changing the RPC to an odd value will cause
an address error when normal mode prefetching begins.
Read Memory Location
Write Memory Location
Read System Register
Write System Register
Dump Memory Block
Read D/A Register
Resume Execution
Write D/A Register
Reset Peripherals
Fill Memory Block
Patch User Code
No Operation
Command
Table 4-6 Background Mode Command Summary
WDREG/WAREG
RDREG/RAREG
Mnemonic
WSREG
RSREG
WRITE
DUMP
CENTRAL PROCESSOR UNIT
READ
CALL
NOP
FILL
RST
GO
Read the selected address or data register and return the
results via the serial interface.
The data operand is written to the specified address or data
register.
The specified system control register is read. All registers that
can be read in supervisor mode can be read in background
mode.
The operand data is written into the specified system control
register.
Read the sized data at the memory location specified by the
long-word address. The source function code register (SFC)
determines the address space accessed.
Write the operand data to the memory location specified by the
long-word address. The destination function code (DFC) reg-
ister determines the address space accessed.
Used in conjunction with the READ command to dump large
blocks of memory. An initial READ is executed to set up the
starting address of the block and retrieve the first result. Sub-
sequent operands are retrieved with the DUMP command.
Used in conjunction with the WRITE command to fill large
blocks of memory. An initial WRITE is executed to set up the
starting address of the block and supply the first operand. Sub-
sequent operands are written with the FILL command.
The pipe is flushed and re-filled before resuming instruction
execution at the current PC.
Current program counter is stacked at the location of the cur-
rent stack pointer. Instruction execution begins at user patch
code.
Asserts RESET for 512 clock cycles. The CPU is not reset by
this command. Synonymous with the CPU RESET instruction.
NOP performs no operation and may be used as a null com-
mand.
Description
USER’S MANUAL
MC68336/376