MMC2114 MOTOROLA [Motorola, Inc], MMC2114 Datasheet - Page 535
MMC2114
Manufacturer Part Number
MMC2114
Description
M CORE Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MMC2114.pdf
(654 pages)
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20.7.1 Read Cycles
MMC2114 • MMC2113 • MMC2112 — Rev. 1.0
MOTOROLA
1. SET R/W TO READ.
2. DRIVE ADDRESS ON A[22:0].
3. DRIVE TSIZ[1:0] PINS FOR OPERAND SIZE.
4. ASSERT CS IF USED.
5. ASSERT OE AND EB IF USED.
1. RECEIVE DATA FROM D[31:16] AND/OR D[15:0].
2. DRIVE DATA TO INTERNAL DATA BUS.
3. NEGATE OE AND EB.
1. NEGATE EB AND CS IF USED.
MMC2114, MMC2113, AND MMC2112
START NEXT CYCLE
TERMINATE CYCLE
ADDRESS DEVICE
ACQUIRE DATA
During a read cycle, the EBI receives data from an external memory or
peripheral device. During external read cycles, the OE pin is asserted
regardless of operand size. See
Figure 20-4
Freescale Semiconductor, Inc.
For More Information On This Product,
Figure 20-1. Read Cycle Flowchart
External Bus Interface Module (EBI)
Go to: www.freescale.com
for read cycle timing diagrams with and without wait states.
1. RECEIVE CS.
2. DECODE ADDRESS.
3. PUT DATA ON D[31:16] AND/OR D[15:0].
4. ASSERT TA IF NECESSARY FROM SLAVE DEVICE.
1. REMOVE DATA FROM D[31:16] AND/OR D[15:0].
2. NEGATE TA.
Figure
EXTERNAL PERIPHERAL
20-1. Also see
External Bus Interface Module (EBI)
TERMINATE CYCLE
PRESENT DATA
Advance Information
Figure 20-3
Bus Master Cycles
and
535
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