5

µPD4704

UP/DOWN

STB

If STB changes from "H" to "L" and a reset is

executed in this period, the latch is also reset.

Post-count value latched

Pre-count value latched

Either pre- or post-count value latched

UP/DOWN

STB

RESET

Fig. 2 Relation Between STB Timing and Counter Value

Fig. 3 STB and RESET Timing

(3)

Carry & borrow outputs

Carry output (the pulse width is virtually the same as the UP or DOWN pulse L period). Similarly, if the counter

A Borrow pulse is also output if a down-count operation is performed while RESET is "H" (during a reset), and

therefore, when a

µPD4704 is added, a reset must be executed at the same time.