M306H7MG-XXXFP Datasheet, PDF (84/329 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER

M306H7MG-XXXFP/MC-XXXFP/FGFP
9. TIMERS
9.1.4 Pulse Width Modulation (PWM) Mode
In PWM mode, the timer outputs pulses of a given width in succession (see Table 9.5). The counter functions as
either 16-bit pulse width modulator or 8-bit pulse width modulator. Figure 9.11 shows TAiMR register in pulse
width modulation mode. Figures 9.12 and 9.13 show examples of how a 16-bit pulse width modulator operates
and how an 8-bit pulse width modulator operates.
Table 9.5 Specifications in PWM Mode
Item
Count source
Count operation
16-bit PWM
8-bit PWM
Count start condition
Count stop condition
Interrupt request generation timing
TAiIN pin function
TAiOUT pin function
Read from timer
Write to timer
Specification
f1, f2, f8, f32, fC32
• Down-count (operating as an 8-bit or a 16-bit pulse width modulator)
• The timer reloads a new value at a rising edge of PWM pulse and continues counting
• The timer is not affected by a trigger that occurs during counting
• High level width n / fj n : set value of TAi register (i=o to 4)
• Cycle time (2¹⁶-1) / fj fixed fj: count source frequency (f1, f2, f8, f32, fC32)
• High level width n x (m+1) / fj n : set value of TAi register high-order address
• Cycle time (2⁸-1) x (m+1) / fj m : set value of TAi register low-order address
• TAiS bit of TABSR register is set to “1” (= start counting)
• The TAiS bit = 1 and external trigger input from the TAiIN pin
• The TAiS bit = 1 and one of the following external triggers occurs
• Timer B2 overflow or underflow,
timer Aj (j=i-1, except j=4 if i=0) overflow or underflow,
timer Ak (k=i+1, except k=0 if i=4) overflow or underflow
TAiS bit is set to “0” (= stop counting)
PWM pulse goes “L”
I/O port or trigger input
Pulse output
An indeterminate value is read by reading TAi register
• When not counting and until the 1st count source is input after counting start
Value written to TAi register is written to both reload register and counter
• When counting (after 1st count source input)
Value written to TAi register is written to only reload register
(Transferred to counter when reloaded next)
Rev.2.10 Oct 25, 2006 Page 84 of 326
REJ03B0152-0210