MC68HC000RC12 Datasheet, PDF (38/189 Pages) Freescale Semiconductor, Inc – 8-/16-/32-Bit Microprocessors User’s Manual

Freescale Semiconductor, Inc.
3.11 SIGNAL SUMMARY
Table 3-4 summarizes the signals discussed in the preceding paragraphs.
Table 3-4. Signal Summary
Signal Name
Mnemonic Input/Output Active State
Address Bus
Data Bus
Address Strobe
Read/Write
A0–A23
D0–D15
AS
R/ W
Data Strobe
DS
Upper and Lower Data Strobes UDS, LDS
Data Transfer Acknowledge
DTACK
Bus Request
BR
Bus Grant
BG
Bus Grant Acknowledge
BGACK
Interrupt Priority Level
IPL 0, IPL 1,
IPL 2
Bus Error
BERR
Mode
MODE
Reset
RESET
Halt
HALT
Enable
E
Valid Memory Address
VMA
Valid Peripheral Address
VPA
Function Code Output
FC0, FC1,
FC2
Clock
CLK
Power Input
Ground
VCC
GND
*Open drain.
Output
Input/Output
Output
Output
Output
Output
Input
Input
Output
Input
Input
Input
Input
Input/Output
Input/Output
Output
Output
Input
Output
Input
Input
Input
High
High
Low
Read-High
Write-Low
Low
Low
Low
Low
Low
Low
Low
Low
High
Low
Low
High
Low
Low
High
High
—
—
Hi-Z
On HALT
On Bus
Relinquish
Yes
Yes
Yes
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
No
No
No
No
No
No
No
No
No
No
No
—
—
No*
No*
No*
No*
No
No
No
Yes
No
No
No
Yes
No
No
—
—
—
—
3-10
M68000 8-/16-/32-BIT MICROPROCESSORS USER'S MANUAL
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