TDA8029 Datasheet, PDF (17/58 Pages) NXP Semiconductors – Low power single card reader

Philips Semiconductors
Low power single card reader
Product specification
TDA8029
Summary of baud rate equations: Timer 2 is in baud rate
generating mode. If timer 2 is being clocked through T2
(P1.0) the baud rate is:
Baud rate = ^{T----i--m-----e---r----2-----o--1-v---6e---r--f--l-o----w------r--a---t--e-}
(3)
If timer 2 is being clocked internally, the baud rate is:
Baud rate = -3---2-----_×-----_[--6---5---O-5---3-s--6-c---i-_–^l--l-a--₍-t-R-o---r-C---f-A-r--e-P--q--2-u--H--e---,n---Rc---y-C-----A----P----2---L----₎---_] (4)
To obtain the reload value for RCAP2H and RCAP2L, the
above equation can be rewritten as:
RCAP2H, RCAP2L = 65536 – _{3----2-----×}-----b-f--a^o---^s_u--^c--d-----r--a---t--e-
(5)
Where f_osc = oscillator frequency.
handbook, full pagewidth
Timer 1
overflow
OSC
T2EX
note fosc is divided by 2, not 12
÷2
C/T2 = 0
TL2
TH2
(8-bit)
(8-bit)
C/T2 = 1
T2
control
TR2
reload
transition
detector
RCAP2L RCAP2H
÷2
0
1
0
1
0
EXF2
control
EXEN2
Timer 2
interrupt
Note availability of additional external interrupt
Fig.5 Timer 2 in baud rate generator mode.
1
SMOD
RCLK
÷ 16
RX clock
TCLK
÷ 16
TX clock
MGW425
2003 Oct 30
17