ZLR16300 Datasheet, PDF (47/94 Pages) Zilog, Inc. – Z8 Low Voltage ROM MCUs with Infrared Timers

Crimzon^TMZLR16300
Product Specification
40
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. You can force
the output 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 NORMAL or PING-PONG mode), an interrupt (CTR2, D1) is generated (if
enabled), and a status bit (CTR2, D5) is set. See Figure 22.
Z8^® Data Bus
CTR2 D2
Positive Edge
Negative Edge
IRQ3
HI16
LO16
CTR2 D4, D3
CTR2 D1
SCLK
Clock
Select
Clock
16-Bit
Counter T16
T16_OUT
Z8^® Data Bus
TC16H
TC16L
Figure 22. 16-Bit Counter/Timer Circuits
Note: Global interrupts override this function as described in
Interrupts on page 44.
If T16 is in Single-Pass mode, it is stopped at this point (see Figure 23). If it is in
Modulo-N Mode, it is loaded with TC16H * 256 + TC16L, and the counting contin-
ues (see Figure 24).
The values in TC16H and TC16L can be modified at any time. The new values
take effect when they are loaded.
PS021413-1205
Functional Description