Zilog Z80180 Manual do Utilizador Página 303

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Z8018x
Family MPU User Manual
287
UM005003-0703
Status Signals
PIN OUTPUTS IN EACH OPERATING MODE
Table 55 describes pin outputs in each operating mode.
Table 55. Pin Outputs in Each Operating Mode
Mode M1 MREQ IORQ RD WR RFSH HALT BUSACK ST
Address
BUS
Data
BUS
CPU
Operation
Op Code Fetch
(1st Op Code)
00 1 011 1 1 0A IN
Op Code Fetch
(except 1 st Op
Code)
00 1 011 1 1 1A IN
MemRead 10 1 011 1 1 1A IN
Memory Write10 1 101 1 1 1A OUT
I/O Read 11 0 011 1 1 1A IN
I/O Write 11 0 101 1 1 1A OUT
Internal
Operation
11 1 111 1 1 1A IN
Refresh 10 1 110 1 1 *A IN
Interrupt
Acknowledge
Cycle
(1st Machine
Cycle)
NMI
00 1 011 1 1 0A IN
INT0
01 0 111 1 1 0A IN
INT1, INT2
&
Internal
Interrupts
11 1 111 1 1 0A IN
BUS RELEASE 1 Z Z Z Z 1 1 0 * Z IN
HALT 00 1 011 0 1 0A IN
SLEEP 1 1 1 1 1 1 0 1 1 1 IN
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