Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller PLCC 44 (16.59x16.59) 8-Bit 40 MHz I/O number 34

85

AT89C51IC2

4301D–8051–02/08

Figure 36. Block Diagram

Address Register

Comparator

Timing &

Control

logic

Arbitration &

Sink Logic

Serial clock

generator

Shift Register

Control Register

Status Register

Status

Decoder

Input

Filter

Output

Stage

Input

Filter

Output

Stage

ACK

Status

Bits

8

8

7

8

Internal Bus

Timer 1

overflow

F

CLK PERIPH

/4

Interrupt

SDA

SCL

SSADR

SSCON

SSDAT

SSCS

PI2.1

PI2.0