ZLF645 MAXIM [Maxim Integrated Products], ZLF645 Datasheet - Page 120

• Manufacturer Part Number: ZLF645
• Description: Flash MCUs with Learning Amplification
• Manufacturer: MAXIM [Maxim Integrated Products]

19-4572; Rev 0; 4/09
Timer Output
Initiating PING-PONG Mode
First, ensure that both counter/timers are not running.
Follow the steps below to initiate the PING-PONG mode:
1. Set T8 into SINGLE-PASS mode (CTR0, bit 6)
2. Set T16 into SINGLE-PASS mode (CTR2, bit 6)
3. Set the PING-PONG mode (CTR1 bits [3:2])
4. Finally, start PING-PONG mode by enabling either T8 (CTR0, D7) or T16 (CTR2,
If you stop the timer and restart the timer, reload the initial value to avoid an unknown 
previous value.
During PING-PONG Mode
The enable bits of T8 and T16 (CTR0, D7; CTR2, D7) are set and cleared alternately by
hardware. The time-out bits (CTR0, bit 5; CTR2, bit 5) are set every time the counter/
timers reach the terminal count.
The output logic for the timers is displayed in
T8_OUT when bit 0 of CTR0 is set. P35 is used to output the value of T16_OUT when bit
Enable
Enable
These instructions are not consecutive and can occur in random order.
D7). The initial value of T8 or T16 must not be
TC8
TC16
Time-out
Figure 38. PING-PONG Mode Diagram
Time-out
Figure 39
1
.
on page 113. P34 is used to output
ZLF645 Series Flash MCUs
Counter/Timer Functional Blocks
Product Specification
Ping-Pong
CTR1 data bits [3:2]
112