83C748 Datasheet, PDF (13/18 Pages) NXP Semiconductors – 80C51 8-bit microcontroller family 2K/64 OTP/ROM, low pin count

Philips Semiconductors
80C51 8-bit microcontroller family
2K/64 OTP/ROM, low pin count
Preliminary specification
83C748/87C748
A0–A10
ADDRESS STROBE
87C748
P3.0–P3.7
V_CC
+5V
P0.0/ASEL
V_SS
PROGRAMMING
PULSES
V_PP/V_IH VOLTAGE
SOURCE
CLK SOURCE
P0.1
P0.2
XTAL1
P1.0–P1.7
DATA BUS
RESET
CONTROL
LOGIC
RESET
Figure 5. Programming Configuration
SU00301
XTAL1
RESET
MIN 2 MACHINE
CYCLES
BIT 0 BIT 1
BIT 2
TEN BIT SERIAL CODE
BIT 3 BIT 4
BIT 5
BIT 6 BIT 7 BIT 8
BIT 9
P0.2 UNDEFINED
P0.1 UNDEFINED
Figure 6. Entry into Program/Verify Modes
SU00302
P0.2 (V_PP) 5V
12.75V
t_SHGL
25 PULSES
P0.1 (PGM)
P0.0 (ASEL)
t_MASEL
t_GLGH
98µs MIN
t_AVGL
t_GHGL
10µs MIN
PORT 3
PORT 1
t_HASET
HIGH ADDRESS
t_HAHLD
LOW ADDRESS
INVALID DATA
VERIFY MODE
t_ADSTA
VALID DATA
t_DVGL t_GHDX
DATA TO BE PROGRAMMED
PROGRAM MODE
Figure 7. Program/Verify Cycle
5V
t_GHSL
t_AVQV
INVALID DATA
VALID DATA
VERIFY MODE
SU00303
1999 Apr 15
13