MC68376BAMFT20 Freescale Semiconductor, MC68376BAMFT20 Datasheet - Page 107

• 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

5.6.2.2 Write Cycle
MC68336/376
USER’S MANUAL
During a write cycle, the MCU transfers data to an external memory or peripheral de-
vice. If the instruction specifies a long-word or word operation, the MCU attempts to
write two bytes at once. For a byte operation, the MCU writes one byte. The portion of
the data bus upon which each byte is written depends on operand size, peripheral ad-
dress, and peripheral port size.
Refer to 5.5.2 Dynamic Bus Sizing and 5.5.4 Misaligned Operands for more infor-
mation. Figure 5-11 is a flowchart of a write-cycle operation for a word transfer. Refer
to the SIM Reference Manual (SIMRM/AD) for more information.
1) NEGATE DS AND AS
2) REMOVE DATA FROM DATA BUS
1) SET R/W TO WRITE
2) DRIVE ADDRESS ON ADDR[23:0]
3) DRIVE FUNCTION CODE ON FC[2:0]
4) DRIVE SIZ[1:0] FOR OPERAND SIZE
ASSERT DS AND WAIT FOR DSACK (S3)
TERMINATE OUTPUT TRANSFER (S5)
PLACE DATA ON DATA[15:0] (S2)
OPTIONAL STATE (S4)
ADDRESS DEVICE (S0)
START NEXT CYCLE
ASSERT AS (S1)
NO CHANGE
MCU
Figure 5-11 Write Cycle Flowchart
SYSTEM INTEGRATION MODULE
1) DECODE ADDRESS
2) LATCH DATA FROM DATA BUS
3) ASSERT DSACK SIGNALS
ACCEPT DATA (S2 + S3)
TERMINATE CYCLE
NEGATE DSACK
PERIPHERAL
MOTOROLA
WR CYC FLOW
5-29