Z86D86 Datasheet, PDF (61/80 Pages) Zilog, Inc. – 28-Pin Low-Voltage OTP Microcontroller

Z86D86
28-Pin Low-Voltage OTP Microcontroller
53
Enable
TC8
Time-out
Enable
Ping-Pong
CTR1, D3, D2
TC16
Time-out
Figure 42. Ping-Pong Mode
Starting Ping-Pong Mode
First, make sure both counter/timers are not running. Then set T8 into Single-
Pass Mode (CTR0, D6), set T16 into Single-Pass Mode (CTR2, D6), and set the
Ping-Pong Mode (CTR1, D2, D3). These instructions do not have to be in any par-
ticular order. Finally, start Ping-Pong Mode by enabling either T8 (CTR0, D7) or
T16 (CTR2, D7).
During Ping-Pong Mode
The enable bits of T8 and T16 (CTR0, D7; CTR2, D7) are set and cleared alter-
nately by hardware. The time-out bits (CTR0, D5; CTR2, D5) are set every time
the counter/timers reach the terminal count.
PS008905-0105
PRELIMINARY