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PXAG49KBBD Datasheet(PDF) 22 Page - NXP Semiconductors |
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PXAG49KBBD Datasheet(HTML) 22 Page - NXP Semiconductors |
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22 / 42 page  Philips Semiconductors Preliminary data XA-G49 XA 16-bit microcontroller family 64K Flash/2K RAM, watchdog, 2 UARTs 2001 Jun 27 22 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 4. 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 9. 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 10. Timer 2 Mode Control (T2MOD) |
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