UPSD3422 datasheet(178/293 Pages) STMICROELECTRONICS

178 / 293 page

Programmable counter array (PCA) with PWM

uPSD34xx

178/293

27.6

Toggle mode

In this mode, the user writes a value to the TCM's CAPCOM registers and enables the

comparator. When there is a match with the Counter output, the output of the TCM pin

toggles. This mode is a simple extension of the Timer Mode.

27.7

PWM mode - (x8), fixed frequency

In this mode, one or all the TCM's can be configured to have a fixed frequency PWM output

on the port pins. The PWM frequency depends on when the low byte of the Counter

overflows (modulo 256). The duty cycle of each TCM module can be specified in the

CAPCOMHn Register. When the PCA_Counter_L value is equal to or greater than the value

in CAPCOMLn, the PWM output is switched to a high state. When the PCA_Counter_L

pulse starts.

Figure 59.

Timer mode

Note:

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

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

MATCH_TIMER

INTR

TCMMODEn

ENABLE

MATCH

PCASTA

CAPCOMLn

PCACLm

PCACHm

16-bit COMPARATOR

CAPCOMHn

INTFn

16-bit up Timer/Counter

EINTF

E_COMP CAP_PE

CAP_NE

MATCH

TOGGLE

PWM1

PWM0

RESET

WRITE to

CAPCOMHn

WRITE to

CAPCOMLn

EN_FLAG

AI07858

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