UPD784927GF datasheet(39/96 Pages) NEC

39 / 96 page

µPD784927, 784928, 784927Y, 784928Y

Data Sheet U12255EJ2V0DS00

(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 through 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

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

UPD784927GF Datasheet(PDF) 39 Page - NEC

UPD784927GF Datasheet(HTML) 39 Page - NEC

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