ISD94100 Series Technical Reference Manual
Sep 9, 2019
Page
423
of 928
Rev1.09
IS
D
9
410
0
S
ER
IE
S
T
E
C
HN
ICA
L
RE
F
E
RE
NCE
M
AN
U
AL
8
to
1
MUX
HCLK
HCLK/2
HCLK/4
HCLK/8
HCLK/16
HCLK/32
HCLK/64
HCLK/128
SFLTCSEL
(PWM_SYNC[19:17])
Noise filter
counter 3-bits
SFLTCNT
(PWM_SYNC[22:20])
PWM0_SYNC_IN
SINPINV
(PWM_SYNC[23])
0
1
SYNC_IN
0
1
2
3
4
5
6
7
SNFLTEN
(PWM_SYNC[16])
Sampling Clock
3
3
Figure 6.8-23 PWM SYNC_IN Noise Filter Block Diagram
User can use SINSRCn (PWM_SYNC[13:8]) bits to select the synchronize source. When SINSRCn
bits is set to 0, user can generate SYNC_IN signal for the next counter’s synchronization when
PWM0_SYNC_IN pin is high or setting SWSYNCn (PWM_SWSYNC[2:0]) to 1. Synchronizing
source can also be selected as CNT = 0 or CNT = PWM_CMPDATm register (if being the up-down
counter type, it will synchronize twice in a PWM period) to trigger a sync event or to disable
SYNC_OUT signal.
When the PHSENn (PWM_SYNC[2:0]) is enabled and the synchronous source has a happening
event, the counter will load a value from the PHS (PWM_PHSn_m[15:0]) register. This method
synchronizes counters to different phase in the same time. In the up-down counter type, user can
set the value in PHSDIRn (PWM_SYNC[26:24]) to control the counter direction after
synchronization. Although the Synchronous function can synchronize channels in phase, it can’t
work from the beginning of PWM enable. To start PWM counters in the same time, user have to set
the PWM Synchronous Start Control Register (PWM_SSCTL[5:0]) to enable the channel counters
which are planned to start counting together, followed by setting the PWM Synchronous Start
Trigger Register CNTSEN (PWM_SSTRG[0]).
For applications, please do not use Group and Synchronous function simultaneously because the
Synchronous function will be inactive.
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