MC68HC000RC12 Datasheet, PDF (31/189 Pages) Freescale Semiconductor, Inc – 8-/16-/32-Bit Microprocessors User’s Manual

Freescale Semiconductor, Inc.
PROCESSOR
STATUS
MC6800
PERIPHERAL
CONTROL
SYSTEM
CONTROL
VCC(2)
GND(2)
CLK
FC0
FC1
FC2
E
VPA
BERR
RESET
HALT
ADDRESS
BUS
A19–A0
DATA BUS D7–D0
MC6808
AS
R/W
DS
DTACK
BR
BG
IPL2/IPL0
IPL1
ASYNCHRONOUS
BUS
CONTROL
BUS
ARBITRATION
CONTROL
INTERRUPT
CONTROL
Figure 3-4. Input and Output Signals (MC68008, 48-Pin Version)
PROCESSOR
STATUS
MC6800
PERIPHERAL
CONTROL
SYSTEM
CONTROL
VCC
GND(2)
CLK
FC0
FC1
FC2
E
VPA
BERR
RESET
HALT
ADDRESS
BUS
A21–A0
DATA BUS D7–D0
MC68008
AS
R/W
DS
DTACK
ASYNCHRONOUS
BUS
CONTROL
BR
BG
BGACK
IPL0
IPL1
IPL2
BUS
ARBITRATION
CONTROL
INTERRUPT
CONTROL
Figure 3-5. Input and Output Signals (MC68008, 52-Pin Version)
3.1 ADDRESS BUS (A23–A1)
This 23-bit, unidirectional, three-state bus is capable of addressing 16 Mbytes of data.
This bus provides the address for bus operation during all cycles except interrupt
acknowledge cycles and breakpoint cycles. During interrupt acknowledge cycles, address
lines A1, A2, and A3 provide the level number of the interrupt being acknowledged, and
address lines A23–A4 are driven to logic high.
MOTOROLA
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
3-3
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