ZLF645 MAXIM [Maxim Integrated Products], ZLF645 Datasheet - Page 111

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

19-4572; Rev 0; 4/09
CTR0 data bits [4:3]
Caution:
Negative Edge
Z8 LXMC Data Bus
SCLK
Z8 LXMC Data Bus
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 coun-
ter.
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, on 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
You can modify the values in TC8H or TC8L at any time. The new values take effect
when they are loaded.
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
TC8H
Clock
Figure 29. 8-Bit Counter/Timer Circuits
HI8
FFh
to
Counter T8
FEh
(TC8)
8-Bit
.
Figure
LO8
TC8L
29.
CTR0 data bit 2
ZLF645 Series Flash MCUs
Counter/Timer Functional Blocks
Product Specification
CTR0 data bit 1
T8_OUT
IRQ4
103