DSPIC30F4012 datasheet(75/236 Pages) MICROCHIP

75 / 236 page

DS70135E-page 73

dsPIC30F4011/4012

11.0

TIMER4/5 MODULE

This section describes the second 32-bit general

purpose timer module (Timer4/5) and associated

operational modes. Figure 11-1 depicts the simplified

block

diagram

the

32-bit

Timer4/5

module.

Figure 11-2 and Figure 11-3 show Timer4/5 configured

as two independent 16-bit timers, Timer4 and Timer5,

respectively.

The Timer4/5 module is similar in operation to the

Timer

2/3

module.

However,

there

are

some

differences, which are as follows:

• The Timer4/5 module does not support the ADC

event trigger feature

• Timer4/5 can not be utilized by other peripheral

modules such as input capture and output compare

The operating modes of the Timer4/5 module are

determined by setting the appropriate bit(s) in the 16-bit

T4CON and T5CON SFRs.

For 32-bit timer/counter operation, Timer4 is the least

significant word and Timer5 is the most significant word

of the 32-bit timer.

FIGURE 11-1:

32-BIT TIMER4/5 BLOCK DIAGRAM

Note: This data sheet summarizes features of this group

of dsPIC30F devices and is not intended to be a complete

reference source. For more information on the CPU,

peripherals, register descriptions and general device

functionality, refer to the dsPIC30F Family Reference

Manual (DS70046). For more information on the device

instruction set and programming, refer to the “dsPIC30F/

33F Programmer’s Reference Manual” (DS70157).

Note:

Timer4 is a ‘Type B’ timer and Timer5 is a

‘Type C’ timer. Please refer to the

appropriate timer type in Section 24.0

“Electrical

Characteristics”

this

document.

Note:

For 32-bit timer operation, T5CON control

bits are ignored. Only T4CON control bits

are used for setup and control. Timer4

clock and gate inputs are utilized for the

32-bit timer module, but an interrupt is

generated with the Timer5 Interrupt Flag

(T5IF) and the interrupt is enabled with the

Timer5 Interrupt Enable bit (T5IE).

TMR5

TMR4

T5IF

Equal

Comparator x 32

PR5

PR4

Reset

LSB

MSB

Event Flag

Note:

Timer configuration bit, T32 (T2CON<3>), must be set to ‘1’ for a 32-bit timer/counter operation. All

control bits are respective to the T4CON register.

Data Bus<15:0>

TMR5HLD

Read TMR4

Write TMR4

TGATE(T4CON<6>)

(T4CON<6>)

TGATE

TON

TCKPS<1:0>

Prescaler

1, 8, 64, 256

TCY

1 x

0 1

0 0

Gate

Sync

T4CK

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