ADE5166 datasheet(109/148 Pages) AD

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ADE5166/ADE5169

Rev. 0 | Page 109 of 148

Mode 2 (8-Bit Timer/Counter with Autoreload)

Mode 2 configures the timer register as an 8-bit counter (TL0)

with automatic reload, as shown in Figure 94. Overflow from TL0

not only sets TF0 but also reloads TL0 with the contents of TH0,

which is preset by software. The reload leaves TH0 unchanged.

TF0

INTERRUPT

P0.6/T0

C/T0 = 0

GATE

INT0

C/T0 = 1

fCORE

TL0

(8 BITS)

CONTROL

TRO

RELOAD

TH0

(8 BITS)

Figure 94. Timer/Counter 0, Mode 2

Mode 3 (Two 8-Bit Timer/Counters)

Mode 3 has different effects on Timer 0 and Timer 1. Timer 1 in

Mode 3 simply holds its count. The effect is the same as setting

TR1 = 0. Timer 0 in Mode 3 establishes TL0 and TH0 as two

separate counters. This configuration is shown in Figure 95.

TL0 uses the Timer 0 control bits, C/T0, Gate0 (see

TR0, TF0 (see

), and the

Table 112

Table 113

INT0 pin. TH0 is locked into

a timer function (counting machine cycles) and takes over the

use of TR1 and TF1 from Timer 1. Therefore, TH0 controls the

Timer 1 interrupt. Mode 3 is provided for applications requiring

an extra 8-bit timer or counter.

When Timer 0 is in Mode 3, Timer 1 can be turned on and off

by switching it out of and into its own Mode 3, or it can be used

by the serial interface as a baud rate generator. In fact, Timer 1

can be used in any application not requiring an interrupt from

Timer 1 itself.

CONTROL

CORE

CLK/12

TF0

TL0

(8 BITS)

INTERRUPT

P0.6/T0

GATE

TR0

TF1

TH0

(8 BITS)

INTERRUPT

fCORE/12

TR1

INT

fCORE

C/T0 = 0

C/T0 = 1

Figure 95. Timer/Counter 0, Mode 3

TIMER 2

Timer/Counter 2 Data Registers

Timer/Counter 2 also has two pairs of 8-bit data registers asso-

ciated with it: Timer 2 high byte SFR (TH2, Address 0xCD),

Timer 2 low byte SFR (TL2, Address 0xCC), Timer 2 reload/

capture high byte SFR (RCAP2H, Address 0xCB), and Timer 2

reload/capture low byte SFR (RCAP2L, Address 0xCA). These

are used both as timer data registers and as timer capture/reload

registers (see Table 119 to Table 122).

Timer/Counter 2 Operating Modes

The following sections describe the operating modes for

Timer/Counter 2. The operating modes are selected by bits in

the Timer/Counter 2 control SFR (T2CON, Address 0xC8),

as shown in Table 114 and Table 123.

Table 123. T2CON Operating Modes

RCLK or TCLK

CAP2

TR2

Mode

16-bit autoreload

16-bit capture

Baud rate

Off

16-Bit Autoreload Mode

The 16-bit autoreload mode has two options that are selected by

EXEN2 (Bit 3) in the Timer/Counter 2 control SFR (T2CON,

Address 0xC8). If EXEN2 = 0 when Timer 2 rolls over, it not only

sets TF2 but also causes the Timer 2 SFRs to be reloaded with the

16-bit value in both the Timer 2 reload/capture high byte SFR

(RCAP2H, Address 0xCB) and Timer 2 reload/capture low byte

SFR (RCAP2L, Address 0xCA) registers, which are preset by

software. If EXEN2 = 1, Timer 2 performs the same events as

when EXEN2 = 0 but adds a 1-to-0 transition at the external input

pin, T2EX, which triggers the 16-bit reload and sets EXF2.

Autoreload mode is shown in Figure 96.

16-Bit Capture Mode

The 16-bit capture mode has two options that are selected by

EXEN2 (Bit 3) in the Timer/Counter 2 control SFR (T2CON,

Address 0xC8). If EXEN2 = 0, Timer 2 is a 16-bit timer or counter

that, upon overflowing, sets the Timer 2 overflow bit (TF2, Bit 7).

This bit can be used to generate an interrupt. If EXEN2 = 1, then

Timer 2 performs the same events as when EXEN2 = 0, but it

adds a l-to-0 transition on the T2E external input, causing the

current value in the Timer 2 SFRs, TL2 (Address 0xCC) and TH2

(Address 0xCD) to be captured into the RCAP2L (Address 0xCA)

and RCAP2H (Address 0xCB) SFRs, respectively. In addition, the

transition at T2EX causes the EXF2 bit (Bit 6) in the T2CON SFR

(Address 0xC8) to be set, and EXF2, like TF2, can generate an

interrupt. Capture mode is shown in Figure 97. The baud rate

generator mode is selected by RCLK = 1 and/or TCLK = 1.

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