EZ80F920120MOD Zilog, EZ80F920120MOD Datasheet - Page 91

• Manufacturer Part Number: EZ80F920120MOD
• Description: MODULE EZ80F92 512K 20MHZ
• Manufacturer: Zilog

Specifications of EZ80F920120MOD

• Module/board Type: Development Module
• Processor Series: EZ80F92x
• Core: eZ80
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 1 MB
• Interface Type: Cable
• Maximum Clock Frequency: 20 MHz
• Operating Supply Voltage: 0 V to 3.3 V
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Package / Case: LQFP
• Development Tools By Supplier: eZ80F920200ZCOG
• Minimum Operating Temperature: 0 C
• For Use With/related Products: eZ80F92
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 269-3157; EZ80F920120MOD

PS015308-0404
Programmable Reload Timer Operation
Setting Timer Duration
There are three factors to consider when determining Programmable Reload Timer dura-
tion—clock frequency, clock divider ratio, and initial count value. Minimum duration of
the timer is achieved by loading
0000h
0000h
The time-out period of the PRT is returned by the following equation:
To calculate the time-out period with the above equation when using an initial value of
0000h
Minimum time-out duration is 4 times longer than the input clock period and is generated
by setting the clock divider ratio to 1:4 and the reload value to
duration is 2
setting the clock divider ratio to 1:256 and the reload value to
Single Pass Mode
In SINGLE PASS mode, when the end-of-count value,
the timer is disabled, and the PRT_EN bit resets to 0. To restart the timer, the CPU must
reenable the timer by setting the PRT_EN bit to 1. An example of a PRT operating in SIN-
GLE PASS mode is illustrated in Figure 21. Timer register information is indicated in
PRT Single Pass Mode Operation Example.
PRT Time-Out Period =
, because the timer first rolls over to
.
, enter a reload value of 65536 (
24
(16,777,216) times longer than the input clock period and is generated by
System Clock Frequency
P R E L I M I N A R Y
Clock Divider Ratio x Reload Value
0001h
FFFFh
. Maximum duration is achieved by loading
FFFFh
+ 1).
and then continues counting down to
0000h
0001h
0000h
, is reached, counting halts,
Programmable Reload Timers
Product Specification
. Maximum time-out
.
eZ80F92/eZ80F93
79