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MC68302FC20 Datasheet(PDF) 83 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) 83 Page - Motorola, Inc

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System Integration Block (SIB)
MOTOROLA
MC68302 USER’S MANUAL
3-33
0 = I/O
1 = Peripheral
0 = Input
1 = Output
0 = I/O
1 = Peripheral
0 = Input
1 = Output
Figure 3-6. Parallel I/O Port Registers
3.4 DUAL-PORT RAM
The CP has 1152 bytes of static RAM configured as a dual-port memory. The dual-port RAM
can be accessed by the CP main controller or by one of three bus masters: the M68000 core,
the IDMA, or an external master. The M68000 core and the IDMA access the RAM synchro-
Port A Control Register(PACNT
15
14
13
12
11
10
9876543210
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
CA
Port A Data Direction Register(PADDR)
15
14
13
12
11
10
9876543210
DA
DA
DA
DA
DA
DA
DA
DA
DA
DA
DA
DA
DA
DA
DA
DA
Port A Data Register(PADAT)
15
14
13
12
11
10
9876543210
PA
PA
PA
PA
PA
PA
PA
PA
PA
PA
PA
PA
PA
PA
PA
PA
Port B Control Register(PBCNT)
15
876543210
RESERVED
CB
CB
CB
CB
CB
CB
CB
CB
Port B Data Direction Register(PBDDR)
15
12
11
10
9876543210
RESERVED
DB
DB
DB
DB
DB
DB
DB
DB
DB
DB
DB
DB
P
ort B Data Register(PBDAT)
15
12
11
10
9876543210
RESERVED
PB
PB
PB
PB
PB
PB
PB
PB
PB
PB
PB
PB


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