TDA8029 Datasheet, PDF (14/59 Pages) NXP Semiconductors – Low power single card reader

Philips Semiconductors
TDA8029
Low power single card reader
OSC
÷ 12
T2
C/T2 = 0
C/T2 = 1
transition
detector
control
TR2
reload
TL2
(8-BIT)
TH2
(8-BIT)
RCAP2L RCAP2H
T2EX
control
EXEN2
Fig 3. Timer 2 in auto-reload mode with DCEN = 0
TF2
EXF2
timer 2
interrupt
mgw423
(down counting reload value)
FFh
FFh
toggle
EXF2
OSC
÷ 12
C/T2 = 0
TL2
C/T2 = 1
T2
control
TR2
overflow
TH2
RCAP2L RCAP2H
(up counting reload value)
Fig 4. Timer 2 in auto-reload mode with DCEN = 1
TF2
interrupt
count
direction
HIGH = up
LOW = down
T2EX
mgw424
8.2.4 Baud rate generator mode
Bits TCLK and/or RCLK in register T2CON allow the serial port transmit and receive baud
rates to be derived from either timer 1 or timer 2. When TCLK = 0, timer 1 is used as the
serial port transmit baud rate generator. When TCLK = 1, timer 2 is used. RCLK has the
same effect for the serial port receive baud rate. With these two bits, the serial port can
have different receive and transmit baud rates, one generated by timer 1, the other by
timer 2.
The baud rate generation mode is like the auto-reload mode, in that a rollover in TH2
causes the timer 2 registers to be reloaded with the 16-bit value in registers RCAP2H and
RCAP2L, which are preset by software.
9397 750 14145
Product data sheet
Rev. 03 — 22 February 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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