MB91155 datasheet(76/105 Pages) FUJITSU

76 / 105 page

MB91F155A/MB91155/MB91154

18. 8/16-bit Up/Down Counters/Timers

This is the up/down counter/timer block consisting of six event input pins, two 8-bit up/down counters, two 8-bit

reload/compare registers, and their control circuits.

The features of this module are as follows :

• Capable of counting in the (0) d- (256) d range by the 8-bit count register.

(In 16-bit

× 1 operating mode, the register can count in the (0) d- (65535) d range.)

• Four count modes to choose from by the count clock.

• In timer mode the count clock can be selected from two internal clock types.

• In up/down count mode an external pin input signal detection edge can be selected.

• The phase-difference count mode is suitable for encoder counting, such as of motors. Rotation angles, rotating

speeds, and so on can be counted accurately and easily by inputting the output of phases A, B, and Z.

• Two types of function to choose from for the ZIN pin. (Enabled in all modes)

• Equipped with compare and reload functions which can be used individually or in combination. When combined,

these functions can count up/down at any width.

• The immediately preceding count direction can be identified by the count direction flag.

• Capable of individually controlling interrupt generation when comparison results match, at occurrence of reload

(underflow) or overflow, or when the count direction changes.

MB91155 Datasheet(PDF) 76 Page - fujitsu semiconductor