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M37151M6 Datasheet(PDF) 42 Page - Renesas Technology Corp |
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M37151M6 Datasheet(HTML) 42 Page - Renesas Technology Corp |
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42 / 138 page  M37151M6/M8/MA/MC/MF-XXXFP, M37151EFFP Rev.1.00 Nov 01, 2002 page 42 of 136 REJ03B0129-0100Z 8.7 PWM OUTPUT FUNCTION This microcomputer is equipped with five 8-bit PWMs (PWM0– PWM4). PWM0–PWM4 have the same circuit structure, an 8-bit reso- lution with minimum resolution bit width of 4 µs (for f(XIN) = 8 MHz) and repeat period of 1024 µs (for f(XIN) = 8 MHz). Figure 8.7.1 shows the PWM block diagram. The PWM timing gen- erating circuit applies individual control signals to PWM0–PWM4 us- ing f(XIN) divided by 2 as a reference signal. 8.7.1 Data Setting When outputting PWM0–PWM4, set 8-bit output data to the PWMi register (i means 0 to 4; addresses 020016 to 020416). 8.7.2 Transmitting Data from Register to PWM circuit Data transfer from the 8-bit PWM register to the 8-bit PWM circuit is executed when writing data to the register. The signal output from the 8-bit PWM output pin corresponds to the contents of this register. 8.7.3 Operating of 8-bit PWM The following explains the PWM operation. First, set bit 0 of PWM mode register 1 (address 020816) to “0” (at reset, bit 0 is already set to “0” automatically), so that the PWM count source is supplied. PWM0–PWM4 are also used as pins P00–P04. Set the correspond- ing bits of the port P0 direction register to “1” (output mode). And select each output polarity by bit 3 of PWM mode register 1 (address 020816). Then, set bits 4 to 0 of PWM mode register 2 (address 020916) to “1” (PWM output). The PWM waveform is output from the PWM output pins by setting these registers. Figure 8.7.2 shows the 8-bit PWM timing. One cycle (T) is com- posed of 256 (28) segments. 8 kinds of pulses, relative to the weight of each bit (bits 0 to 7), are output inside the circuit during 1 cycle. Refer to Figure 8.7.2 (a). The 8-bit PWM outputs a waveform which is the logical sum (OR) of pulses corresponding to the contents of bits 0 to 7 of the 8-bit PWM register. Several examples are shown in Figure 8.7.2 (b). 256 kinds of output (HIGH area: 0/256 to 255/256) are selected by changing the contents of the PWM register. An en- tirely HIGH section cannot be output, i.e. 256/256. 8.7.4 Output after Reset At reset, the output of ports P00–P04 is in the high-impedance state, and the contents of the PWM register and the PWM circuit are unde- fined. Note that after reset, the PWM output is undefined until setting the PWM register. |
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