z86e72 ZiLOG Semiconductor, z86e72 Datasheet - Page 63

• Manufacturer Part Number: z86e72
• Description: Otp Microcontroller
• Manufacturer: ZiLOG Semiconductor

PS008704-0507
Z8 Data Bus
CTR2 D4, D3
SCLK
Z8 Data Bus
Pos Edge
Neg Edge
Note:
Sixteen-Bit Counter/Timer Circuits
Figure 32
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 is generated if enabled (CTR2 D1), and
a status bit (CTR2 D5) is set.
If T16 is in Single-Pass Mode, it is stopped at this point (see
Modulo-N Mode, it is loaded with TC16H * 256 + TC16L, and the counting contin-
ues (see
Select
Clock
Global interrupts override this function as described in
“Interrupts” on page 62.
Figure 32. Sixteen-Bit Counter/Timer Circuits
Figure
shows the 16-bit counter/timer circuits.
TC16H
Clock
34).
HI16
Counter
16-Bit
T16
LO16
TC16L
CTR2 D2
OTP Microcontroller
Figure
CTR2 D1
T16_OUT
33). If it is in
IRQ3
59