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XA-G37 Datasheet(PDF) 13 Page - NXP Semiconductors

Part No. XA-G37
Description  XA 16-bit microcontroller family 32K OTP, 512 B RAM, watchdog, 2 UARTs
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

XA-G37 Datasheet(HTML) 13 Page - NXP Semiconductors

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Philips Semiconductors
Product data
XA-G37
XA 16-bit microcontroller family
32K OTP, 512 B RAM, watchdog, 2 UARTs
2002 Mar 25
11
timer register is loaded with FFFF hex. The underflow also sets the
TF2 flag, which can generate an interrupt if enabled.
The external flag EXF2 toggles when Timer 2 underflows or
overflows. This EXF2 bit can be used as a 17th bit of resolution, if
needed. the EXF2 flag does not generate an interrupt in this mode.
As the baud rate generator, timer T2 is incremented by TCLK.
Baud Rate Generator Mode
By setting the TCLKn and/or RCLKn in T2CON or T2MOD, the
Timer 2 can be chosen as the baud rate generator for either or both
UARTs. The baud rates for transmit and receive can be
simultaneously different.
Programmable Clock-Out
A 50% duty cycle clock can be programmed to come out on P1.6.
This pin, besides being a regular I/O pin, has two alternate
functions. It can be programmed (1) to input the external clock for
Timer/Counter 2 or (2) to output a 50% duty cycle clock ranging from
3.58Hz to 3.75MHz at a 30MHz operating frequency.
To configure the Timer/Counter 2 as a clock generator, bit C/T2 (in
T2CON) must be cleared and bit T20E in T2MOD must be set. Bit
TR2 (T2CON.2) also must be set to start the timer.
The Clock-Out frequency depends on the oscillator frequency and
the reload value of Timer 2 capture registers (TCAP2H, TCAP2L) as
shown in this equation:
TCLK
2
(65536
* TCAP2H, TCAP2L)
In the Clock-Out mode Timer 2 roll-overs will not generate an
interrupt. This is similar to when it is used as a baud-rate generator.
It is possible to use Timer 2 as a baud-rate generator and a clock
generator simultaneously. Note, however, that the baud-rate will be
1/8 of the Clock-Out frequency.
Table 1. Timer 2 Operating Modes
TR2
CP/RL2
RCLK+TCLK
DCEN
MODE
0
X
X
X
Timer off (stopped)
1
0
0
0
16-bit auto-reload, counting up
1
0
0
1
16-bit auto-reload, counting up or down depending on T2EX pin
1
1
0
X
16-bit capture
1
X
1
X
Baud rate generator
T0OE
LSB
MSB
BIT
SYMBOL
FUNCTION
TSTAT.2
T1OE
When 0, this bit allows the T1 pin to clock Timer 1 when in the counter mode.
When 1, T1 acts as an output and toggles at every Timer 1 overflow.
TSTAT.0
T0OE
When 0, this bit allows the T0 pin to clock Timer 0 when in the counter mode.
When 1, T0 acts as an output and toggles at every Timer 0 overflow.
SU00612B
T1OE
TSTAT
Address:411
Bit Addressable
Reset Value: 00H
Figure 5. Timer 0 And 1 Extended Status (TSTAT)
DCEN
BIT
SYMBOL
FUNCTION
T2MOD.5 RCLK1
Receive Clock Flag.
T2MOD.4 TCLK1
Transmit Clock Flag. RCLK1 and TCLK1 are used to select Timer 2 overflow rate as a clock source
for UART1 instead of Timer T1.
T2MOD.1 T2OE
When 0, this bit allows the T2 pin to clock Timer 2 when in the counter mode.
When 1, T2 acts as an output and toggles at every Timer 2 overflow.
T2MOD.0 DCEN
Controls count direction for Timer 2 in autoreload mode.
DCEN=0 counter set to count up only
DCEN=1 counter set to count up or down, depending on T2EX (see text).
SU00610B
T2OE
TCLK1
RCLK1
T2MOD
Address:419
Bit Addressable
Reset Value: 00H
LSB
MSB
Figure 6. Timer 2 Mode Control (T2MOD)


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