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7721 Datasheet(PDF) 235 Page - Renesas Technology Corp |
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7721 Datasheet(HTML) 235 Page - Renesas Technology Corp |
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235 / 577 page  SERIAL I/O 7721 Group User’s Manual 11–32 11.4 Clock asynchronous serial I/O (UART) mode 11.4.1 Transfer rate (Frequency of transfer clock) The transfer rate is determined by the BRGi (addresses 3116, 3916). When setting “n” into BRGi, BRGi divides the count source frequency by (n + 1). The BRGi’s output is further divided by 16, and the resultant clock becomes the transfer clock. Accordingly, “n” is expressed by the following formula. n = — 1 F 16 ! B n: Value set in BRGi (0016 to FF16) F: BRGi’s count source frequency (Hz) B: Transfer rate (bps) An internal clock or an external clock can be selected as the BRGi’s count source with the internal/external clock select bit (bit 3 at addresses 3016, 3816). When an internal clock is selected, the clock selected with the BRG count source select bits (bits 0 and 1 at addresses 3416, 3C16) becomes the BRGi’s count source. When an external clock is selected, the clock input to the CLKi pin becomes the BRGi’s count source. Set the same transfer rate for both transmitter and receiver sides. Tables 11.4.3 and 11.4.4 list the setting examples of transfer rate. Table 11.4.3 Setting examples of transfer rate (1) BRGi’s set value : n 79 (4F16) 159 (9F16) 79 (4F16) 39 (2716) 159 (9F16) 79 (4F16) 52 (3416) 39 (2716) 19 (1316) Actual time (bps) 300.00 600.00 1200.00 2400.00 4800.00 9600.00 14490.57 19200.00 38400.00 BRGi’s count source f64 f16 f16 f16 f2 f2 f2 f2 f2 BRGi’s set value : n 80 (5016) 162 (A216) 80 (5016) 40 (2816) 162 (A216) 80 (5016) 53 (3516) 40 (2816) 24 (1816) Actual time (bps) 301.41 599.12 1205.63 2381.86 4792.94 9645.06 14467.59 19054.58 31250.00 BRGi’s count source f64 f16 f16 f16 f2 f2 f2 f2 f2 f(XIN) = 25 MHz f(XIN) = 24.576 MHz Transfer rate (bps) 300 600 1200 2400 4800 9600 14400 19200 31250 38400 BRGi’s set value : n 71 (4716) 143 (8F16) 71 (4716) 35 (2316) 143 (8F16) 71 (4716) 47 (2F16) 35 (2316) 23 (1716) 21 (1516) 17 (1116) 11 (0B16) 5 (0516) 2 (0216) Actual time (bps) 300.00 600.00 1200.00 2400.00 4800.00 9600.00 14400.00 19200.00 28800.00 31418.18 38400.00 57600.00 115200.00 230400.00 BRGi’s count source f64 f16 f16 f16 f2 f2 f2 f2 f2 f2 f2 f2 f2 f2 f(XIN) = 22.1184 MHz Transfer rate (bps) 300 600 1200 2400 4800 9600 14400 19200 28800 31250 38400 57600 115200 230400 Table 11.4.4 Setting examples of transfer rate (2) |
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