MC68306 Motorola, MC68306 Datasheet - Page 25

• Manufacturer Part Number: MC68306
• Description: Integrated EC000 Processor
• Manufacturer: Motorola

NOTES:
1. Pullup may be required, value depends on individual application. Must not be left floating.
NOTES:
3. Pin has internal pullup, but external pulldown may be required for correct initialization.
2.1 BUS SIGNALS
The following signals are used for the MC68306 bus.
2.1.1 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. During interrupt acknowledge cycles, address lines A1, A2, and A3
provide the level number of the interrupt being acknowledged, and address lines A23–A4
MOTOROLA
Channel A Receiver Serial Data
Channel A Transmitter Serial
Data
Channel B Receiver Serial Data
Channel B Transmitter Serial
Data
Channel A Clear-to-Send
Channel A Request-to-Send
Channel B Clear-to-Send
Channel B Request-to-Send
Crystal Output
Crystal Input or External Clock
Parallel Input 2
Parallel Output 3
Test Clock
Test Data Input
Test Data Output
Test Mode Select
Test Reset
Signal Name
Signal Name
Table 2-6. Serial Module Signal Summary
Table 2-7. JTAG Signal Summary
Mnemonic
RTSA /OP0
RTSB /OP1
Mnemonic
CTSA /IP0
CTSB /IP1
MC68306 USER'S MANUAL
X1/CLK
RxDA
RxDB
TRST
TxDA
TxDB
TDO
TMS
OP3
TCK
IP2
TDI
X2
Output
Output
Output
Output
Output
Output
Output
Output
Output
Input/
Input/
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Three-State During
Three-State During
Bus Arbitration
Bus Arbitration
No
No
No
No
No
No
—
—
—
—
—
—
—
—
—
—
—
Pulldown Required
Pullup Required
4.7 K (3)
(1)
(1)
(1)
2- 5