mc68331cpv20b1 Freescale Semiconductor, Inc, mc68331cpv20b1 Datasheet - Page 232

• Manufacturer Part Number: mc68331cpv20b1
• Description: Mc68331 32 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

D
R/W — Read/Write
STRB — Address Strobe/Data Strobe
DSACK — Data Strobe Acknowledge
SPACE — Address Space Select
IPL — Interrupt Priority Level
AVEC — Autovector Enable
D-24
0 = ASYNC 00 = Disable
This field causes a chip select to be asserted only for a read, only for a write, or for
both read and write.
This field specifies the source of DSACK in asynchronous bus mode and controls wait
state insertion.
This field selects an address space to be used by the chip-select logic.
This field determines interrupt priority level when a chip select is used for interrupt ac-
knowledge. It does not affect CPU interrupt recognition.
Do not enable autovector support when in synchronous mode.
1 = SYNC
MODE
0 = Address strobe
1 = Data strobe
0 = External interrupt vector enabled
1 = Autovector enabled
01 = Lower
10 = Upper
11 = Both
BYTE
Table D-12 Option Register Function Summary
Freescale Semiconductor, Inc.
01 = Read
00 = Rsvd
10 = Write
For More Information On This Product,
11 = Both
R/W
Go to: www.freescale.com
REGISTER SUMMARY
0 = AS
1 = DS
STRB
1010 = 10 WAIT
1011 = 11 WAIT
1100 = 12 WAIT
1101 = 13 WAIT
1111 = External
0000 = 0 WAIT 00 = CPU SP
0001 = 1 WAIT 01 = User SP 001 = Priority 1
0100 = 4 WAIT
0101 = 5 WAIT
0110 = 6 WAIT
0111 = 7 WAIT
1000 = 8 WAIT
1001 = 9 WAIT
0010 = 2 WAIT 10 = Supv SP 010 = Priority 2
0011 = 3 WAIT
1110 = F term
DSACK
11 = S/U SP
SPACE
011 = Priority 3
100 = Priority 4
101 = Priority 5
110 = Priority 6
111 = Priority 7
000 = All
IPL
USER’S MANUAL
MC68331
0 = Off
1 = On
AVEC