Z86L82 datasheet(57/80 Pages) ZILOG

57 / 80 page

Z86L82/85/88

28-Pin Low-Voltage IR Microcontrollers

PS009007-1202

Sixteen-Bit Counter/Timer Circuits

Figure 38 shows the 16-bit counter/timer circuits.

Figure 38. 16-Bit Counter/Timer Circuits

T16 Transmit Mode

In Normal or Ping-Pong Mode, the output of T16, when not enabled, is dependent

on CTR1, D0. If the result is a 0, T16_OUT is a 1; if it is a 1, T16_OUT is 0. You

can force the output of T16 to either a 0 or 1 whether it is enabled or not by pro-

gramming CTR1 D3, D2 to a 10 or 11.

When T16 is enabled, TC16H * 256 + TC16L is loaded, and T16_OUT is switched

to its initial value (CTR1 D0). When T16 counts down to 0, T16_OUT is toggled (in

Normal or Ping-Pong Mode), an interrupt is generated if enabled (CTR2 D1), and

a status bit (CTR2 D5) is set.

Global interrupts override this function as described in

“Interrupts” on page 54.

If T16 is in Single-Pass Mode, T16 is stopped at this point (see Figure 39). If T16

is in Modulo-N Mode, T16 is loaded with TC16H * 256 + TC16L and the counting

continues (see Figure 40).

Z8 Data Bus

Pos Edge

Neg Edge

CTR2 D4, D3

SCLK

Z8 Data Bus

Clock

Select

Clock

16-Bit

Counter

TC16H

TC16L

CTR2 D2

IRQ3

CTR2 D1

T16_OUT

HI16

LO16

T16

Note:

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