Z86L71 datasheet(34/61 Pages) ZILOG

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Z86L70/71/75/C71

IR/Low-Voltage Microcontroller

Zilog

1-34

P R E L I M I N A R Y

DS97LVO0500

FUNCTIONAL DESCRIPTION (Continued)

T16 Transmit Mode

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

enabled is dependent on CTR1, D0. If it is a 0, T16_OUT

is a 1; if it is a 1, T16_OUT is 0. The user can force the out-

put of T16 to either a 0 or 1 whether it is enabled or not by

programming 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 Nor-

mal or Ping-Pong Mode), an interrupt is generated if en-

abled (CTR2 D1), and a status bit (CTR2 D5) is set. Note

that global interrupts will override this function as de-

scribed in the interrupts section. If T16 is in Single-Pass

Mode, it is stopped at this point. If it is in Modulo-N Mode,

it is loaded with TC16H * 256 + TC16L and the counting

continues.

The user can modify the values in TC16H and TC16L at

any time. The new values take effect when they are load-

ed. Care must be taken not to load these registers at the

time the values are to be loaded into the counter/timer, to

ensure known operation. An initial count of 1 is not al-

lowed. An initial count of 0 will cause T16 to count from 0

to %FFFF to %FFFE. Transition from 0 to %FFFF is not a

time-out condition.

Figure 24. 16-Bit Counter/Timer Circuits

Z8 Data Bus

Pos Edge

Neg Edge

CTR2 D2

IRQ3

CTR2 D1

T16_OUT

TC16L

TC16H

Clock

Select

SCLK

CTR2 D4, D3

Clock

16-Bit

Counter

T16

HI16

LO16

Z8 Data Bus

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