83C749 Datasheet, PDF (3/22 Pages) NXP Semiconductors – 80C51 8-bit microcontroller family 2K/64 OTP/ROM, 5 channel 8-bit A/D, PWM, low pin count

Philips Semiconductors
80C51 8-bit microcontroller family
2K/64 OTP/ROM, 5 channel 8-bit A/D, PWM, low pin count
Preliminary specification
83C749/87C749
BLOCK DIAGRAM
V_CC
V_SS
RAM ADDR
REGISTER
RAM
P0.0–P0.4
PORT 0
DRIVERS
PORT 0
LATCH
PWM
PORT 2
LATCH
ROM/
EPROM
B
REGISTER
ACC
TMP2
TMP1
STACK
POINTER
ALU
PSW
PCON
TCON
IE
TH0 TL0
RTH RTL
INTERRUPT AND
TIMER BLOCKS
RST
TIMING
AND
CONTROL
PD
OSCILLATOR
ADC
X1
X2
AV_SS AV_CC
PORT 1
LATCH
PORT 1
DRIVERS
P1.0–P1.7
PORT 3
LATCH
PORT 3
DRIVERS
P3.0–P3.7
PROGRAM
ADDRESS
REGISTER
BUFFER
PC
INCRE-
MENTER
PROGRAM
COUNTER
DPTR
SU00305
1998 Apr 23
3