Datasheet

45
3286P–MICRO–3/10
AT89S8253
Figure 26-1. Flash/EEPROM Programming and Verification Waveforms – Parallel Mode
V
CC
RST
XTAL 1
PSEN
EA/V
PP
ALE/PROG
P3.3...P3.7
P1.0...P1.7
and P2.0...P2.5
PORT 0
P3.0
(RDY/BSY)
t
PWRDN
Running at 3 MHz
t
OSTL
t
HSTL
t
MSTP
t
PGW
t
ASTP
t
PSTP
t
DSTP
t
AHLD
t
DHLD
t
BLT
t
MHLD
t
MSTP
t
VFY
t
XRL
t
PLX
t
PHLD
t
WC
t
PHBL
ADDR0
ADDR1
DATA 0
DATA 1
ADDR0 ADDR1
DATA 0
DATA 1
t
PWRUP
t
RHX