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MC68302FC20 Datasheet(PDF) 85 Page - Motorola, Inc

Part No. MC68302FC20
Description  Integrated Multiprotocol Processor User’s Manual
Download  480 Pages
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Maker  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com
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MC68302FC20 Datasheet(HTML) 85 Page - Motorola, Inc

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System Integration Block (SIB)
MOTOROLA
MC68302 USER’S MANUAL
3-35
Figure 3-7. RAM Block Diagram
3.5 TIMERS
The MC68302 includes three timer units: two identical general-purpose timers and a soft-
ware watchdog timer.
Each general-purpose timer consists of a timer mode register (TMR), a timer capture regis-
ter (TCR), a timer counter (TCN), a timer reference register (TRR), and a timer event register
(TER). The TMR contains the prescaler value programmed by the user. The software watch-
dog timer, which has a watchdog reference register (WRR) and a watchdog counter (WCN),
uses a fixed prescaler value. The timer block diagram is shown in Figure 3-8.
M68000
SYSTEM
ADDRESS
BUS
INTERNAL
PERIPHERAL
ADDRESS
BUS
CP µCODE
ADDRESS
CP µCODE DATA
SYSTEM RAM
576 BYTES
PERIPHERAL
DATA BUS
M68000
DATA BUS
(DATA RAM
OR
µCODE RAM)
PARAMETER RAM
576 BYTES


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