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A8351601L-40 Datasheet(PDF) 22 Page - AMIC Technology |
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A8351601L-40 Datasheet(HTML) 22 Page - AMIC Technology |
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22 / 44 page  A8351601 Series (July, 2002, Version 1.0) 21 AMIC Technology, Inc. Modes 1,3 Baud Rate Using Timer 2 to Generate Baud Rates In the A8351601, setting TCLK and/or RCLK in T2CON selects Timer 2 as the baud rate generator. Under these conditions, the baud rates for transmit and receive can be simultaneously different. Setting RCLK and/or TCLK puts Timer 2 into its baud rate generator mode, as shown in Figure 8. The baud rate generator mode is similar to the auto-reload mode, in that a rollover in TH2 reloads the Timer 2 registers with the 16-bit value in the RCAP2H and RCAP2L registers, which are preset by software. In this case, the baud rates in Mode 1 and 3 are determined by the Timer 2 overflow rate according to the following Equation. Modes 1,3 Baud Rate = 16 Rate Overflow 2 Timer Timer 2 can be configured for either timer or counter operation. In the most typical applications, it is configured for timer operation (C/ T2= 0). Normally, a timer increments every machine cycle (thus at 1/12 the oscillator frequency), but timer operation is a different for Timer 2 when it is used as a baud rate generator. As a baud rate generator, Timer 2 increments every state time (thus at 1/2 the oscillator frequency). In this case, the baud rate is given by the following formula. = RCAP2L)] (RCAP2H, - [65536 X 32 Frequency Oscillator Table 9. Commonly Used Baud Rates Generated by Timer 1 Where (RCAP2H, RCAP2L) is the content of RCAP2H and RCAP2L taken as a 16-bit unsigned integer. Figure 7 shows Timer 2 as a baud rate generator. This figure is valid only if RCLK + TCLK = 1 in T2CON. A rollover in TH2 does not set TF2 and does no generate an interrupt. Therefore, the Timer 2 interrupt does not have to be disabled when Timer 2 is in the baud rate generator mode. If EXEN2 is set, a 1-to-0 transition in T2EX sets EXF2 but does not cause a reload from (RCAP2H, RCAP2L) to (TH2, TL2). Thus, when Timer 2 is used as a baud rate generator, T2EX can be used as an extra external interrupt. When Timer 2 is running (TR2 = 1) as a timer in the baud rate generator mode, programmers should not read from or write to TH2 or TL2. Under these conditions, Timer 2 is incremented every state time, and the results of a read or write may not be accurate. The RCAP registers may be read, but should not be written to, because a write might overlap a reload and cause write and/or reload errors. Turn Timer 2 off (clear TR2) before accessing the Timer 2 or RCAP registers, in this case. Timer 1 Baud Rate fOSC SMOD C/ T Mode Reload Value Mode 0 Max: 1 MHz 12 MHz X X X X Mode 2 Max: 375K 12 MHz 1 X X X Modes 1,3: 62.5K 12 MHz 1 0 2 FFH 19.2K 11.059 MHz 1 0 2 FDH 9.6K 11.059 MHz 0 0 2 FDH 4.8K 11.059 MHz 0 0 2 FAH 2.4K 11.059 MHz 0 0 2 F4H 1.2K 11.059 MHz 0 0 2 E8H 137.5 11.986 MHz 0 0 2 1DH 110 6 MHz 0 0 2 72H 110 12 MHz 0 0 1 FEEBH |
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