32186 datasheet(412/1032 Pages) RENESAS

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10.4 TIO (Input/Output-Related 16-Bit Timer)

MULTIJUNCTION TIMERS

10-116

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

Figure 10.4.12 Reload 0 and Reload 1 Register Updates in PWM Output Mode

(a) When reload register updates take effect in the current period (reflected in the next period)

Count clock

H'FFFF

H'7FFF

H'8000

Timing at which reload 0 is updated

Operation by new reload value written

Reload 0 register

Reload 1 register

F/F output

Write to reload 1

Write to reload 0

(Reload 1 data latched)

H'1000

H'2000

H'8000

H'9000

Timing at which PWM period latched

and reload 1 buffer is updated.

Reload 0 register

Reload 1 register

Counter

Interrupt due

to underflow

F/F output

Reload 1 buffer

H'9000

H'1000

H'8000

H'9000

H'0001

H'FFFF

H'1000

H'7FFF

H'2000

H'8000

H'9000

H'7FFE

H'0000

H'2000

H'9000

New PWM

output period

Old PWM

output period

Enlarged

view

New PWM

output period

Note: • This diagram does not show detailed timing information.

H'1000

H'0FFF

H'2000

H'8000

H'9000

(b) When reload register updates take effect in the next period (reflected one period later)

Operation by old reload value

H'1000

H'2000

H'8000

H'9000

H'0FFE

H'2000

H'9000

Write to reload 1

Write to reload 0

(Reload 1 data latched)

Timing at which reload 0 is updated

PWM period latched

Count clock

Reload 0 register

Reload 1 register

Counter

Interrupt due

to underflow

Reload 0 register

Reload 1 register

F/F output

Reload 1 buffer

H'1000

H'2000

H'9000

H'0001

H'FFFF

H'1000

H'0FFF

H'8000

H'9000

H'0FFE

H'0000

H'2000

Old PWM

output period

Old PWM

output period

Old PWM

output period

Enlarged

view

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