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R27 Datasheet(PDF) 184 Page - Renesas Technology Corp

Part # R27
Description  RENESAS 16-BIT SINGLE-CHIP MCU R8C FAMILY / R8C/2x SERIES
PDF  487 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

R27 Datasheet(HTML) 184 Page - Renesas Technology Corp

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R8C/26 Group, R8C/27 Group
14. Timers
Rev.2.10
Sep 26, 2008
Page 165 of 453
REJ09B0278-0210
Figure 14.17
Operating Example of Timer RB when Counter Value is Rewritten during Count
Operation
Count source
Reloads register of
timer RB prescaler
IR bit in TRBIC
register
0
Counter of
timer RB prescaler
Reloads register of
timer RB
Counter of timer RB
Set 01h to the TRBPRE register and 25h to
the TRBPR register by a program.
After writing, the reload register is
written with the first count source.
Reload with
the second
count source
Reload on
underflow
After writing, the reload register is
written on the first underflow.
Reload on the second
underflow
The IR bit remains unchanged until underflow
is generated by a new value.
When the TWRC bit is set to 0 (write to reload register and counter)
Count source
Reloads register of
timer RB prescaler
IR bit in TRBIC
register
Counter of
timer RB prescaler
Reloads register of
timer RB
Counter of timer RB
Set 01h to the TRBPRE register and 25h to
the TRBPR register by a program.
After writing, the reload register is
written with the first count source.
Reload on
underflow
After writing, the reload register is
written on the first underflow.
Reload on
underflow
Only the prescaler values are updated,
extending the duration until timer RB underflow.
When the TWRC bit is set to 1 (write to reload register only)
05h
04h
03h
02h
01h
00h
01h
00h
01h
00h
06h
01h
00h
01h
03h
00h
02h
01h
25h
New value (25h)
Previous value
New value (01h)
Previous value
New value (01h)
Previous value
05h
04h
01h
00h
01h
00h
01h
00h
01h
00h
06h
New value (25h)
Previous value
03h
24h
02h
25h
The above applies under the following conditions.
Both bits TSTART and TCSTF in the TRBCR register are set to 1 (During count).
0



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