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Philips Semiconductors Product specification 8-bit microcontroller with on-chip CAN P8xC592 Notes to the alternative Port functions 1. Port lines P1.6 and P1.7 may be selected as CTX0 and CTX1 outputs of the serial port SIO1 (CAN). After reset P1.6 and P1.7 may be used as normal I/O ports, if the CAN interface is not used. 2. Unused analog inputs can be used as digital inputs. As Port 5 lines may be used as inputs to the ADC, these digital inputs have an inherent hysteresis to prevent the input logic from drawing too much current from the power lines when driven by analog signals. Channel-to-channel crosstalk should be taken into consideration when both digital and analog signals are simultaneously input to Port 5 (see Chapter 20). handbook, full pagewidth Q from port latch input data read port pin 2 oscillator periods INPUT BUFFER strong pull-up Fig.8 I/O buffers in the P8xC592 (P1.0 to P1.5, Ports 2, 3, and 4). 9 PULSE WIDTH MODULATED OUTPUTS (PWM) Two Pulse Width Modulated (PWM) output channels are available with the P8xC592. These channels provide output pulses of programmable length and interval. The repetition frequency is defined by an 8-bit prescaler PWMP which generates the clock for the counter. Both the prescaler and counter are common to both PWM channels. The 8-bit counter counts modulo 255 i.e. from 0 to 254 inclusive. The value of the 8-bit counter is compared to the contents of two registers: PWM0 and PWM1. Provided the contents of either of these registers is greater than the counter value, the output of PWM0 or PWM1 is set LOW. If the contents of these register are equal to, or less than the counter value, the output will be HIGH. The pulse-width-ratio is therefore defined by the contents of the register PWM0 and PWM1. The pulse-width-ratio is in the range of 0 to 255 ⁄255 and may be programmed in increments of 1 ⁄255. 1996 Jun 27 16 p1 n p2 I1 p3 +5 V I/O PIN PORT 1, 2, 3 or 4 MGA153 The repetition frequency fPWM, at the PWMn outputs is given by: f PWM f CLK = ------------------------------------------------------------- 2 × ( PWMP + 1) × 255 When using an oscillator frequency of 16 MHz, for example, the above formula would give a repetition frequency range of 123 Hz to 31.4 kHz. By loading the PWM registers with either 00H or FFH, the PWM outputs can be retained at a constant HIGH or LOW level respectively. When loading FFH to the PWM registers, the 8-bit counter will never actually reach this (FFH) value. Both output pins PWMn are driven by push-pull drivers, and are not shared with any other function.
Philips Semiconductors Product specification 8-bit microcontroller with on-chip CAN P8xC592 9.1 Prescaler frequency control register (PWMP) Table 7 Prescaler frequency control register (address FEH) 7 6 5 4 3 2 1 0 PWMP.7 PWMP.6 PWMP.5 PWMP.4 PWMP.3 PWMP.2 PWMP.1 PWMP.0 Table 8 Description of PWMP bits BIT SYMBOL FUNCTION 7 to 0 PWMP.7 to PWMP.0 9.2 Pulse Width Register 0 (PWM0) Table 9 Pulse Width Register (address FCH) Table 10 Description of PWM0 bits 9.3 Pulse Width Register 1 (PWM1) Table 11 Pulse width register (address FDH) Table 12 Description of PWM1 bits Prescaler division factor. The Prescaler division factor = (PWMP) + 1. 7 6 5 4 3 2 1 0 PWM0.7 PWM0.6 PWM0.5 PWM0.4 PWM0.3 PWM0.2 PWM0.1 PWM0.0 BIT SYMBOL FUNCTION 7 to 0 PWM0.7 to PWM0.0 Pulse width ratio. 7 6 5 4 3 2 1 0 PWM1.7 PWM1.6 PWM1.5 PWM1.4 PWM1.3 PWM1.2 PWM1.1 PWM1.0 BIT SYMBOL FUNCTION 7 to 0 PWM1.7 to PWM1.0 LOW/HIGH ratio of PWMn signals Pulse width ratio. LOW/HIGH ratio of PWMn signals 1996 Jun 27 17 ( PWMn) = ----------------------------------------- 255– ( PWMn) ( PWMn) = ----------------------------------------- 255– ( PWMn)
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