Cypress S6J3200 Series, Manual

Page: 394 / 1355

CHAPTER 16:Stepper Motor Controller
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G 393
4.3.
PWM Selection Register (PWS)
The PWM Selection Register (PWS) sets the output state of the Stepper Motor Controller pins ("L", "H",
PWM pulse or "Hi-Z") and allows the update of the PWM duty cycle or output pin states.
REGISTER_NAME SMCi_PWS
OFFSET 0x00000006
ACCESS_SIZE B, H
MULTIPLE 1
NUMERIC_TYPE
-
OTHER
-
BIT_OFFSET 15 14 13 12 11 10 9 8
BIT_NAME Reserved BS P2[2:0] M2[2:0]
ACCESS_TYPE R0,W0 R/+W R/W R/W
PROT_TYPE Rp/Wp
INITIAL_VALUE 0 0 0 0
BIT_OFFSET 7 6 5 4 3 2 1 0
BIT_NAME Reserved P1[2:0] M1[2:0]
ACCESS_TYPE R0/W0 R/W R/W
PROT_TYPE Rp/Wp
INITIAL_VALUE 0 0 0
[bit15] Reserved: Reserved bit
When writing, always write "0".
When reading, "0" is always read.
[bit14] BS: Output Update bit
The Output Update bit (BS) synchronously updates the Selector.Output Selection bits and PWM Pulse
Generator.Compare Data Value (See Figure3-3). To change the settings for the PWM duty cycle or output
pin states, the BS bit must be set to "1"after (or at the same time) a new configuration is written to the
PWM1 and PWM2 Compare Registers (PWC1, PWC2) and PWM Selection Register (PWS). If the BS bit
is set to "1"while PWM Pulse Generators are operating, the new settings are loaded at the end of the
current PWM cycle. The BS bit is cleared automatically at the beginning of the following PWM cycle. As
long as BS bit is "0", the PWM duty cycle and output pin states are not changed.
This bit can also be set by the PWSS.BSS bit.
Bit Description
0 Disables the update of the setting for the PWM output
1 Enables the update of the setting for the PWM output
Notes:
−
If the PWM Pulse Generator is started(PWC.CE="1"), operate following steps because the PWM
Pulse Generator.Compare Data Value must be initialized.