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PCA84C622CT Datasheet(PDF) 8 Page - NXP Semiconductors |
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PCA84C622CT Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 24 page 1995 May 01 8 Philips Semiconductors Product specification 8-bit microcontrollers for remote control transmitters PCA84C122; 222; 422; 622; 822 8 HARDWARE MODULATOR The Hardware Modulator is the main derivative part in the PCA84C122. Figure 7 shows the internal architecture. The Hardware Modulator generates a pulse train whereby the ON-time of a pulse and the OFF-time between pulses can be programmed in a number of clock cycles (period = 1/fosc); see Figs 8 and 7. The number of pulses of the train is also programmable. The time between pulse bursts is determined by software, possibly using the standard 8-bit Timer/Counter. 8.1 Interface between the 84CXXX core and derivative logic There are three (derivative) registers and one (derivative) counter that must be loaded from the core. Fig.7 Hardware Modulator. MCD255 - 1 internal bus (IB0 – 7) CONTROL LOGIC control PULSE COUNTER HIGH (2) PULSE TIMER PULSE COUNTER LOW (8) OFF-TIME REGISTER (8) ON-TIME REGISTER (8) CONTROL REGISTER (5) f osc OUT (8) Fig.8 Example pulse train output of OUT pin. OFF-time ON-time pulse #1 pulse #2 pulse #3 interrupt end elapse time by software OFF-time = 4 (off-time register = 2) ON-time = 2 (on-time register = 0) number of pulses = 3 start MCD254 OUT |
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