Cypress S6J3200 Series, Manual

Page: 377 / 1355

CHAPTER 16:Stepper Motor Controller
376 S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G
3.
Operation of the Stepper Motor Controller
This section describes the operation of the Stepper Motor Controller.
3.1 Operation of PWM Pulse Generator
3.2 Selection of Motor Drive Signals
3.3 Synchronization System of Stepper Motor Controller
3.4 Operation of the SMC Trigger Delay Function
3.1.
Operation of PWM Pulse Generator
The PWM period is determined by the selected division ratio from a Peripheral clock (CLKP) and the
operation mode (8-bit/10-bit) of the PWM Pulse Generator:
−
During configuration, software can select the PWM operating clock by specifying the division ratio
for the Peripheral clock (CLKP). The division ratio for the Peripheral clock is defined by setting the
PWM operating clock prescaler bits (PWC.P[3:0]).
−
Software can also configure the operation mode for the counter that controls the PWM period.
When the Operation Mode Switching bit (PWC.SC) is set to "0", 8-bit operation mode is selected
(PWM period = 256 counts). If this bit is set to "1", 10-bit operation mode is selected (PWM period =
1024 counts).
Examples of operating clock values for different configurations are given in Table 3 1.
Table 3-1 Relation between PWM Operating Clock and PWM Period for Different Operation Modes
PWC
P[3:0]
PWM
Operating
Clock
(CLK)
PWM Period [µs]
(CLKP = 16 MHz) PWM Period [µs]
(CLKP = 60 MHz)
PWC
SC = "0"
PWC
SC = "1"
PWC
SC = "0"
PWC
SC = "1"
0000 CLKP 16 64 4.267 17.067
0001 CLKP/4 64 256 17.067 68.267
0010 CLKP/5 80 320 21.333 85.333
0011 CLKP/6 96 384 25.6 102.4
0100 CLKP/8 128 512 34.133 136.533
0101 CLKP/10 160 640 42.667 170.667
0110 CLKP/12 192 768 51.2 204.8
0111 CLKP/16 256 1024 68.267 273.067
1000 CLKP/2 32 128 8.533 34.133
1001 CLKP/8 128 512 34.133 136.533
1010 CLKP/10 160 640 42.667 170.667
1011 CLKP/12 192 768 51.2 204.8
1100 CLKP/16 256 1024 68.267 273.067
1101 CLKP/20 320 1280 85.333 341.333
1110 CLKP/24 384 1536 102.4 409.6
1111 CLKP/32 512 2048 136.533 546.133
CLKP: Peripheral clock