ZLP128ICE01ZEM Zilog, ZLP128ICE01ZEM Datasheet - Page 69

• 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
CTR0 data bits [4:3]
Note:
Negative Edge
Z8 LXM Data Bus
SCLK
Z8 LXM Data Bus
Caution:
Positive Edge
When T8 is enabled, the output T8_OUT switches to the initial value (CTR1, bit 1). If the
initial value (CTR1, bit 1) is 0, TC8L is loaded; otherwise, TC8H is loaded into the
counter. In SINGLE-PASS mode (CTR0, Bit 6), T8 counts down to 0 and stops, T8_OUT
toggles, the time-out status bit (CTR0, bit 5) is set, and a time-out interrupt can be
generated if it is enabled (CTR0, bit 1). In MODULO-N mode, upon reaching terminal
count, T8_OUT is toggled, but no interrupt is generated. From that point, T8 loads a new
count (if the T8_OUT level now is 0), TC8L is loaded; if it is 1, TC8H is loaded. T8
counts down to 0, toggles T8_OUT, and sets the time-out status bit (CTR0, bit 5), thereby
generating an interrupt if enabled (CTR0, bit 1). One cycle is thus completed. T8 then
loads from TC8H or TC8L according to the T8_OUT level and repeats the cycle (see
Figure
You can modify the values in TC8H or TC8L at any time. The new values take effect
when they are loaded.
The ‘h’ suffix denotes hexadecimal values.
An initial count of 1 is not allowed (a non-function occurs). An initial count of 0 causes
TC8 to count from 0 to
Select
Clock
20).
Figure 20. 8-Bit Counter/Timer Circuits
TC8H
Clock
HI8
P R E L I M I N A R Y
Counter T8
FFh
(TC8)
8-Bit
to
FEh
.
LO8
TC8L
CTR0 data bit 2
Product Specification
CTR0 data bit 1
T8_OUT
IRQ4
Timers
63