ZLP128ICE01ZEM Zilog, ZLP128ICE01ZEM Datasheet - Page 77

• Manufacturer Part Number: ZLP128ICE01ZEM
• Description: EMULATOR CRIMZON Z8 ZLP12840
• Manufacturer: Zilog

Specifications of ZLP128ICE01ZEM

• Interface Type: RS-232, Ethernet, USB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 269-3829

PS024410-0108
Timer Output
Initiating PING-PONG Mode
First, ensure that both counter/timers are not running. Set T8 into SINGLE-PASS mode
(CTR0, bit 6), set T16 into SINGLE-PASS mode (CTR2, bit 6), and set the PING-PONG
mode (CTR1 bits [3:2]). These instructions are not consecutive and can occur in random
order. Finally, start PING-PONG mode by enabling either T8 (CTR0, D7) or T16 (CTR2,
D7). The initial value of T8 or T16 must not be
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
0 of CTR2 is set. When bit 6 of CTR1 is set, P36 outputs the logic combination of
T8_OUT and T16_OUT via bits [4:5] of CTR1.
Enable
Enable
TC8
TC16
Figure 29. PING-PONG Mode Diagram
Time-Out
P R E L I M I N A R Y
Time-Out
Figure 30
1
. If you stop the timer and restart the
on page 72. P34 is used to output
Ping-Pong
CTR1 data bits [3:2]
Product Specification
Timers
71