EZ80F91MCU Datasheet, PDF (146/396 Pages) Zilog, Inc. – eZ80Acclaim-TM Flash Microcontrollers

eZ80F91 MCU
Product Specification
127
Programmable Reload Timers
Programmable Reload Timers Overview
The eZ80F91 device features four programmable reload timers. The core of each
timer is a 16-bit downcounter. In addition, each timer features a selectable clock
source, adjustable prescaling and can operate in either SINGLE PASS or CON-
TINUOUS mode.
In addition to the basic timer functionality, some of the timers support specialty
modes that perform event counting, input capture, output compare, and PWM
generation functions. PWM mode supports four individually-configurable outputs
and a power trip function.
Each of the 4 timers available on the eZ80F91 device can be controlled individu-
ally. They do not share the same counters, reload registers, control registers, or
interrupt signals. A simplified block diagram of a programmable reload timer is
illustrated in Figure 25.
Each timer features its own interrupt, which is triggered either by the timer reach-
ing zero or after a successful comparison occurs. As with the other eZ80F91 inter-
rupts, the priority is fully programmable.
CONTROL
Input Capture
Registers
ICx
R
E
L
16-Bit
O
Down Counter
A
16
D
SCLK
DIV
M
RTC CLK
U
X
ECx
EOC IC
PWM
OC PWR Trip
IRQ Control
Comparator
OCx
16
Output Compare
Registers
PWM
Control
PWM
IRQ
Figure 25. Programmable Reload Timer Block Diagram
PS019209-0504
PRELIMINARY
Programmable Reload Timers