m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 304

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
3.1 Long-Period Timers
Overview
Specifications
Operation
Figure 3.1.1. Operation timing of long-period timers
Timer A0 count
start flag
Timer A1 count
start flag
Timer A0 interrupt
request bit
Timer A1 interrupt
request bit
In this process, Timer A0 and Timer A1 are connected to make a 16-bit timer with a 16-bit
prescaler. Figure 3.1.1 shows the operation timing, Figure 3.1.2 shows the connection dia-
gram, and Figures 3.1.3 and 3.1.4 show the set-up procedure.
Use the following peripheral functions:
(1) Set timer A0 to timer mode, and set timer A1 to event counter mode.
(2) Perform a count on count source f
(3) Connect a 16-MHz oscillator to X
(1) Setting the count start flag to “1” causes the counter to begin counting. The counter of
(2) If the counter of timer A0 underflows, the counter reloads the content of the reload register
(3) If the counter of timer A1 underflows, the counter reloads the content of the reload register
• Timer mode of timer A
• Event counter mode of timer A
FFFF
FFFF
0000
0000
on timer A0 using timer A1 to count for 1 second.
timer A0 performs a down count on count source f
and continues counting. At this time, the timer A0 interrupt request bit goes to “1”. The
counter of timer A1 performs a down count on underflows in timer A0.
and continues counting. At this time, the timer A1 interrupt request bit goes to “1”.
16
n
16
“1”
“0”
“1”
“0”
“1”
“0”
“1”
“0”
16
16
l
l = reload register content
n = reload register content
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(1) Start count
Start count.
Set to “1” by software
(2) Timer A0 underflow
Cleared to “0” when interrupt request is accepted, or cleared by software
IN
1
.
using timer A0 to count for 1 ms, and perform a count
Cleard “0” by software
1
.
(3) Timer A1 underflow
Set to “1” by software
3. Timer A Applications
Time
Time