TSC87C51 TEMIC Semiconductors, TSC87C51 Datasheet - Page 21

• Manufacturer Part Number: TSC87C51
• Description: CMOS 0 to 25 MHz Programmable 8-bit Microcontroller
• Manufacturer: TEMIC Semiconductors

Rev. E
Clock Waveforms
This diagram indicates when signals are clocked internally. The time it takes the signals to propagate to the pins,
however, ranges from 25 to 125ns. This propagation delay is dependent on variables such as temperature and pin
loading. Propagation also varies from output to output and component. Typically though (T
and WR propagation delays are approximately 50ns. The other signals are typically 85ns. Propagation delays are
incorporated in the AC specifications.
EXTERNAL PROGRAM MEMORY FETCH
READ CYCLE
WRITE CYCLE
PORT OPERATION
SERIAL PORT SHIFT CLOCK
MOV PORT SRC
INTERNAL
MOV DEST PORT (P1. P2. P3)
(INCLUDES INTO. INT1. TO T1)
MOV DEST P0
P2 (EXT)
TXD (MODE 0)
CLOCK
XTAL2
PSEN
–
ALE
WR
RD
P0
P0
P2
P0
P2
July 03, 2000
SAMPLED
DATA
STATE4
P1
FLOAT
P2
PCL OUT
STATE5
P1
INDICATES ADDRESS TRANSITIONS
DPL OR Rt OUT
DPL OR Rt OUT
P0 PINS SAMPLED
P2
P1, P2, P3 PINS SAMPLED
RXD SAMPLED
INDICATES DPH OR P2 SFR TO PCH TRANSITION
INDICATES DPH OR P2 SFR TO PCH TRANSITION
STATE6
P1
OLD DATA
P2
SAMPLED
FLOAT
DATA
NEW DATA
STATE1
P1
P2
PCL OUT
STATE2
P1
THESE SIGNALS ARE NOT ACTIVATED DURING THE
EXECUTION OF A MOVX INSTRUCTION
DATA OUT
FLOAT
P2
SAMPLED
DATA
STATE3
P1
P2
FLOAT
SAMPLED
P1, P2, P3 PINS SAMPLED
P0 PINS SAMPLED
DATA
STATE4
P1
PCL OUT (EVEN IF PROGRAM
MEMORY IS INTERNAL)
TSC87C51
A
P2
RXD SAMPLED
MEMORY IS EXTERNAL)
PCL OUT (IF PROGRAM
=25_C fully loaded) RD
PCL OUT (IF PROGRAM
MEMORY IS EXTERNAL)
PCL OUT
STATE5
P1
P2
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