UPSD3312D datasheet(157/272 Pages) STMICROELECTRONICS

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UPSD33xx

Programmable counter array (PCA) with PWM

Doc ID 9685 Rev 7

157/272

Figure 48.

PWM mode - (x8), fixed frequency

m = 0: n = 0, 1, or 2

m = 1: n = 3, 4, or 5

26.8

PWM mode - (x8), programmable frequency

In this mode, the PWM frequency is not determined by the overflow of the low byte of the

Counter. Instead, the frequency is determined by the PWMFm register. The user can load a

value in the PWMFm register, which is then compared to the low byte of the Counter. If there

is a match, the Counter is cleared and the Load registers (PWMFm, CAPCOMHn) are re-

loaded for the next PWM pulse. There is only one PWMFm register which serves all 3 TCM

in a PCA block.

If one of the TCM modules is operating in this mode, the other modules in the PCA must be

configured to the same mode or left not to be used. The duty cycle of the PWM can be

specified in the CAPCOMHn register as in the PWM with fixed frequency mode. Different

TCM modules can have their own duty cycle.

Note:

The value in the Frequency register (PWMFm) must be larger than the duty cycle register

(CAPCOM).

CAPCOMHn

OVERFLOW

ENABLE

PCACLm

CAPCOMLn

8-bit COMPARATORn

CEXn

MATCH

SET

CLR

TCMMODEn

EINTF

E_COMP CAP_PE

CAP_NE

MATCH

TOGGLE

PWM1

PWM0

AI07859

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