EZ80F91MCU ZILOG [Zilog, Inc.], EZ80F91MCU Datasheet - Page 148

• Manufacturer Part Number: EZ80F91MCU
• Description: eZ80Acclaim-TM Flash Microcontrollers
• Manufacturer: ZILOG [Zilog, Inc.]

Figure 26. Example: PRT SINGLE PASS Mode Operation
PS019209-0504
TMR3_CTL Write
Interrupt Request
(Timer Enable)
System Clock
Clock Enable
T3 Count
To calculate the time-out period with the above equation when using an initial
value of
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
Maximum time-out duration is 2
period, and is generated by 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 (
ing halts, the timer is disabled, and the TMRx_CTL[TIM_EN] bit resets to 0. To
reenable the timer, the CPU must set the TIM_EN bit to 1. An example of a PRT
operating in SINGLE PASS mode is illustrated in Figure 26. Timer register infor-
mation is indicated in Table 50.
Table 50. Example: PRT SINGLE PASS Mode Parameters
Parameter
Timer Enable
Reload
Prescaler Divider = 4
SINGLE PASS Mode
End of Count Interrupt Enable
Timer Reload Value
0000h
0000h
0
, enter a reload value of 65536 (
.
4
P R E L I M I N A R Y
24
Control Register(s)
TMR
TMR
TMR
TMR
TMR
{TMR
(16,777,216) times longer than the input clock
3
x
x
x
x
x
x
_CTL[TIM_EN]
_CTL[RLD]
_CTL[CLK_DIV]
_CTL[TIM_CONT]
_IER[IRQ_EOC_EN]
_RR_H, TMRx_RR_L}
2
FFFFh
+ 1).
0000h
1
Programmable Reload Timers
Product Specification
), is reached, count-
Value
1
1
00b
0
1
0004h
eZ80F91 MCU
0
0001h
.
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