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Rev.1.10 Jul 01, 2005 page 116 of 318
REJ09B0124-0110
M16C/6N Group (M16C/6NK, M16C/6NM) 12. Timers
Under development
This document is under development and its contents are subject to change.
Figure 12.22 Operation Timing When Measuring Pulse Width
Figure 12.21 Operation Timing When Measuring Pulse Period
Count source
Measurement pulse
TBiS bit
IR bit in
TBiIC register
Timing at which counter
reaches "0000h"
"H"
"1"
Transfer
(indeterminate value)
"L"
"0"
"0"
MR3 bit in
TBiMR register
"1"
"0"
i = 0 to 5
NOTES:
1. Counter is initialized at completion of measurement.
2. Timer has overflown.
3. This timing diagram is for the case where the MR1 to MR0 bits in the TBiMR register are "00b" (measure the interval
from falling edge to falling edge of the measurement pulse).
(NOTE 1)(NOTE 1)
(NOTE 2)
Transfer
(measured value)
"1"
Reload register counter
transfer timing
The TB0S to TB2S bits are assigned to bit 5 to bit 7 in the TABSR register, and the TB3S to TB5S bits
are assigned to bit 5 to bit 7 in the TBSR register.
Set to "0" upon accepting an interrupt request or by writing in program
Measurement pulse
"H"
Count source
Timing at which counter
reaches "0000h"
"1"
"1"
Transfer
(measured value)
Transfer
(measured value)
"L"
"0"
"0"
"1"
"0"
(NOTE 1)(NOTE 1)(NOTE 1)
Transfer
(measured
value)
(NOTE 1)
(NOTE 2)
Transfer
(indeterminate
value)
Reload register counter
transfer timing
TBiS bit
Set to "0" upon accepting an interrupt request or by
writing in program
i = 0 to 5
NOTES:
1. Counter is initialized at completion of measurement.
2. Timer has overflown.
3. This timing diagram is for the case where the MR1 to MR0 bits in the TBiMR register are "10b" (measure the
interval from a falling edge to the next rising edge and the interval from a rising edge to the next falling edge
of the measurement pulse).
The TB0S to TB2S bits are assigned to bit 5 to bit 7 in the TABSR register, and the TB3S to TB5S bits
are assigned to bit 5 to bit 7 in the TBSR register.
MR3 bit in
TBiMR register
IR bit in
TBiIC register