80C32E_14 Datasheet, PDF (16/20 Pages) ATMEL Corporation – 8032 Pin and Instruction Compatible

Figure 14. Clock Waveforms
INTERNAL
CLOCK
STATE4
P1P2
STATE5
P1P2
STATE6
P1P2
STATE1
P1P2
STATE2 STATE3
P1P2
P1P2
STATE4 STATE5
P1P2
P1P2
XTAL2
ALE
EXTERNAL PROGRAM MEMORY FETCH
PSEN
THESE SIGNALS ARE NOT ACTIVATED DURING THE
EXECUTION OF A MOVX INSTRUCTION
P0
DATA
SAMPLED
FLOAT
P2 (EXT)
READ CYCLE
RD
P0
P2
PCL OUT
DATA
SAMPLED
FLOAT
INDICATES ADDRESS
TRANSITIONS
PCL OUT
DATA
SAMPLED
FLOAT
PCL OUT
DPL OR Rt OUT
PCL OUT (IF PROGRAM
MEMORY IS EXTERNAL)
FLOAT
INDICATES DPH OR P2 SFR TO PCH TRANSITION
WRITE CYCLE
WR
P0
P2
PCL OUT (EVEN IF
MEMORY IS INTERNAL)
DPL OR Rt OUT
DATA OUT
INDICATES DPH OR P2 SFR TO PCH TRANSITION
PCL OUT (IF PROGRAM
MEMORY IS EXTERNAL)
PORT OPERATION
MOV DEST P0
OLD DATA _{NEW DATA}
P0 PINS SAMPLED
MOV DEST PORT (P1, P2,
(INCLUDES INT0, INT1, TO, T1)
P1, P2, P3 PINS SAMPLED
SERIAL PORT SHIFT CLOCK
TXD (MODE 0)
RXD SAMPLED
P0 PINS SAMPLED
P1, P2, P3 PINS SAMPLED
RXD SAMPLED
This diagram indicates when signals are clocked internally. The time it takes the signals to propagate to the pins, however,
ranges from 25 to 125 ns. This propagation delay is dependent on variables such as temperature and pin loading. Propaga-
tion also varies from output to output and component. Typically though (T_A=25°C fully loaded) RD and WR propagation
delays are approximately 50 ns. The other signals are typically 85 ns. Propagation delays are incorporated in the AC
specifications.
16 80C32E
4149N–AERO–04/07