DSPIC30F4012 datasheet(77/238 Pages) MICROCHIP

77 / 238 page

DS70135G-page 77

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

illustrate

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,

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 “16-bit MCU and DSC

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

T4CK is not implemented and this line is tied to VSS.

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(1)

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