PFS154 datasheet(49/91 Pages) PADAUK

49 / 91 page

PFS154

8bit MTP Type IO Controller

Page 49 of 91

PDK-DS-PFS154_CN_V105 –Jun. 9, 2020

Time

Counter

0xFF

bound

Time

Output-pin

Time out and

Interrupt request

Mode 0 – Period Mode

Event Trigger

Time

Counter

0xFF

bound

Time

Output-pin

Time out and

Interrupt request

Mode 1 – 8-bit PWM Mode

Time

Counter

0x3F

bound

Time

Output-pin

Time out and

Interrupt request

Mode 1 – 6-bit PWM Mode

Event Trigger

Time

Counter

0xFF

bound

Time

Output-pin

Time out and

Interrupt request

Mode 0 – Period Mode

Event Trigger

Time

Counter

0xFF

bound

Time

Output-pin

Time out and

Interrupt request

Mode 1 – 8-bit PWM Mode

Time

Counter

0x3F

bound

Time

Output-pin

Time out and

Interrupt request

Mode 1 – 6-bit PWM Mode

Event Trigger

Fig. 15: Timing diagram of Timer2 in period mode and PWM mode (tm2c.1=1)

5.13.1

Using the Timer2 to generate periodical waveform

If periodical mode is selected, the duty cycle of output is always 50%; its frequency can be summarized as

below:

Frequency of Output = Y ÷ [2 × (K+1) × S1 × (S2+1) ]

Where,

Y = tm2c[7:4] : frequency of selected clock source

K = tm2b[7:0] : bound register in decimal

S1 = tm2s[6:5] : pre-scalar (S1= 1, 4, 16, 64)

S2 = tm2s[4:0] : scalar register in decimal (S2= 0 ~ 31)

Example 1:

tm2c = 0b0001_1000, Y=8MHz

tm2b = 0b0111_1111, K=127

tm2s = 0b0_00_00000, S1=1, S2=0

 frequency of output = 8MHz ÷ [ 2 × (127＋1) × 1 × (0＋1) ] = 31.25KHz

Example 2:

tm2c = 0b0001_1000, Y=8MHz

tm2b = 0b0111_1111, K=127

tm2s[7:0] = 0b0_11_11111, S1=64 , S2 = 31

 frequency = 8MHz ÷ ( 2 × (127＋1) × 64 × (31＋1) ) =15.25Hz

Example 3:

tm2c = 0b0001_1000, Y=8MHz

tm2b = 0b0000_1111, K=15

tm2s = 0b0_00_00000, S1=1, S2=0

 frequency = 8MHz ÷ ( 2 × (15＋1) × 1 × (0＋1) ) = 250KHz

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