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8031/8051/8751
GATE
COUNTER/TIMER
RUN
INTERRUPT
REQUEST
TIMERI COUNTER 0 IN MODE 3
COUNTER 1
MODE
0:
S-BIT
TIMER
WITH
PRESCALERI
8-BIT COUNTER WITH PRESCALER
MODE
1:
16-BIT TIMER/COUNTER
MODE
2:
S-BIT AUTO-RELOAD TIC
MODE
3:
PREVENTS INCREMENTING
OF
TIC 1
COUNTER 0
l
~:=-
__
J:~~====~[)-----------.j
8-BITTIMER
(THO)
Figure
2.5.8
Timer/Counter
1
Control
and Status Flag
Circuitry
,------
-------~N;,;T;;;--I
,---------,
INTERRUPT
PULSE TO
SERIAL PORT
I
I
I
I
I
I
I
r-----*iU
___
...,..
.....
___
J-----.--~~~~SMIT
I
L
________
L-_--_--_--_----_--_--_----_--.....I--'-~;~:IVE
Figure 2.6.A Serial
Port-Synchronous
Mode
0
.10
OR
11
BIT
FRAME
I-
- - - - - - - - -
~R~S;;"T-;;
-
----1
•
BAUD
RATE I
GENERATION FROM
OSCILLATOR
OR
TIMER 1 I
• ADDRESS FRAME I
RECOGNITION
CRYSTAL
OSCILLATOR
TIMER 1
OVERFLOW
I
I
I
I
I
,.----------,
INTERRUPT
t-
____
..,-.~~~~SMIT
4-
__
-,..,
___
'"
RECEIVER
=:;-;=;-:;:=-:;;;=-=:;-;;=I::;N=T=ER;:-R=U:;:P~T======c;;;;If__-~~i!1VE
Figure 2.6.8 Serial
Port-UART
Modes 1, 2, and 3
7-7