EZ80190AZ050SC00TR Zilog, EZ80190AZ050SC00TR Datasheet - Page 42

• Manufacturer Part Number: EZ80190AZ050SC00TR
• Description: IC EZ80 ACCLAIM 50MHZ 100LQFP
• Manufacturer: Zilog

Specifications of EZ80190AZ050SC00TR

• Processor Type: eZ80
• Features: High Speed, Single-Cycle Instruction-Fetch
• Speed: 50MHz
• Voltage: 3.3V
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Programmable Reload Timer Operation
PS006614-1208
PRT Clock
PRT Count
Value
(CLK/2)
IOWRN
Interrupt
Request
CLK
Setting Timer Duration
SINGLE PASS Mode
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
edge. Maximum duration is achieved by loading
FFFFh
The time-out period of the PRT is returned by the following equation:
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.
operating in SINGLE PASS mode. Timer register information is listed in
on page 33.
PRT Time-Out Period =
x
on the next clock edge and then continues counting down to
Figure 4. PRT SINGLE PASS Mode Operation Example
I/O Write to TMRx_CTL
4
Enables PRT
0001h
Clock Divider Ratio x Reload Value
3
System Clock Frequency
, because the timer times out on the next clock
2
0000h
Figure 4
0000h
, because the timer rolls over to
1
displays an example of a PRT
, is reached, counting halts,
Programmable Reload Timers
Product Specification
0000h
0
Table 3
.
eZ80190
32