ZLR64400ROMMCU datasheet(71/155 Pages) ZILOG

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PS024502-1205

P R E L I M I N A R Y

Counter/Timer Functional Blocks

ZLR64400 ROM MCU

Product Specification

Using the same instructions for stopping the counter/timers and setting the status bits is

not recommended.

Two successive commands are necessary. First, the counter/timers must be stopped. Sec-

ond, the status bits must be reset. These commands are required because it takes one

counter/timer clock interval for the initiated event to actually occur. See Figures 21 and

22.

T8 Demodulation Mode

The user must program TC8L and TC8H to ÚÚ¸. After T8 is enabled, when the first edge

(rising, falling, or both depending on CTR1 bits [5:4]) is detected, it starts to count down.

When a subsequent edge (rising, falling, or both depending on CTR1 bits [5:4]) is detected

during counting, the current value of T8 is complemented and put into one of the capture

registers. If it is a positive edge, data is put into LO8; if it is a negative edge, data is put

into HI8. From that point, one of the edge detect status bits (CTR1, bits [1:0]) is set, and

an interrupt can be generated if enabled (CTR0, bit 2). Meanwhile, T8 is loaded with ÚÚ¸

Figure 21. T8_OUT in Single-Pass Mode

Figure 22. T8_OUT in Modulo-N Mode

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ZLR64400ROMMCU Datasheet(PDF) 71 Page - Zilog, Inc.