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UPD784915B Datasheet(PDF) 37 Page - NEC |
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UPD784915B Datasheet(HTML) 37 Page - NEC |
37 / 86 page µPD784915B, 784916B 37 (7) Up/down counter unit The up/down counter unit is a counter that realizes a linear time counter. This unit consists of an up/down counter (UDC) and a compare register (UDCC). The up/down counter counts up the rising edges of PBCTL and counts down the falling edges of PBCTL. When the value of the up/down counter coincides with the value of the compare register, or when the counter underflows, an interrupt request is generated. Figure 3-14. Block Diagram of Up/Down Counter Unit (8) PWM output unit The PWM output unit has three 16-bit accuracy output lines (PWM0, PWM1, and PWM5) and 8-bit accuracy output lines (PWM2 to PWM4). The carrier frequency of all the output lines is 62.5 kHz (fCLK = 8 MHz). PWM0 and PWM1 can be used to control the drum motor and capstan motor. Figure 3-15. Block Diagram of 16-Bit PWM Output Unit INTUDC UDC UDCC EDVC output PTO10 PTO11 PBCTL P77 SELUD UP/DOWN Internal bus 16 8 8 8 15 8 7 0 PWMn (n = 0, 1, 5) Reload To selector Reload control Reload 16 MHz 8-bit down counter 1/256 PWM pulse generation circuit 8-bit counter Output control circuit RESET PWMn PWMC0 |
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Similar Description - UPD784915B |
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