ADE7566 datasheet(112/148 Pages) AD

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ADE75xx/ADE71xx

Preliminary Technical Data

Rev. PrE | Page 112 of 148

Table 104. Timer 2 High byte SFR (TH2, 0xCD)

Bit Location

Bit Mnemonic

Default

Value

Description

7-0

TH2

Timer 2 Data high byte

Table 105. Timer 2 Low byte SFR (TL2, 0xCC)

Bit Location

Bit Mnemonic

Default

Value

Description

7-0

TL2

Timer 2 Data high byte

Table 106. Timer 2 Reload/capture High byte SFR (RACP2H, 0xCB)

Bit Location

Bit Mnemonic

Default

Value

Description

7-0

TH2

Timer 2 Reload/capture high byte

Table 107. Timer 2 Reload/capture Low byte SFR (RACP2L, 0xCA)

Bit Location

Bit Mnemonic

Default

Value

Description

7-0

TL2

Timer 2 Reload/capture low byte

TIMER 0 AND TIMER 1

Timer/Counter 0 and 1 Data Registers

Each timer consists of two 8-bit registers: Timer 0 High byte

SFR (TH0, 0x8C), Timer 0 Low byte SFR (TL0, 0x8A), Timer 1

High byte SFR (TH1, 0x8D) and Timer 1 Low byte SFR (TL1,

0x8B) These can be used as independent registers or combined

into a single 16-bit register, depending on the timers’ mode

configuration – see Table 100 to Table 103.

Timer/Counter 0 and 1 Operating Modes

This section describes the operating modes for Timer/Counters

0 and 1. Unless otherwise noted, these modes of operation are

the same for both Timer 0 and Timer 1.

Mode 0 (13-Bit Timer/Counter)

Mode 0 configures an 8-bit timer/counter. Figure 69 shows

Mode 0 operation. Note that the divide-by-12 prescaler is not

present on the single-cycle core.

FCORE

CONTROL

P0.6/T0

GATE

INT0

TR0

TF0

TL0

(5 BITS)

TH0

(8 BITS)

INTERRUPT

C/ T = 0

C/ T = 1

Figure 69. Timer/Counter 0, Mode 0

In this mode, the timer register is configured as a 13-bit register.

As the count rolls over from all 1s to all 0s, it sets the timer

overflow flag, TF0. TF0 can then be used to request an interrupt.

The counted input is enabled to the timer when TR0 = 1 and

either Gate = 0 or INT0 = 1. Setting Gate = 1 allows the timer to

be controlled by external input INT0 to facilitate pulse-width

measurements. TR0 is a control bit in the Timer/Counter 0 and

1 Control SFR (TCON, 0x88); the Gate bit is in Timer/Counter

0 and 1 Mode SFR (TMOD, 0x89). The 13-bit register consists

of all 8 bits of Timer 0 High byte SFR (TH0, 0x8C) and the

lower 5 bits of Timer 0 Low byte SFR (TL0, 0x8A). The upper 3

bits of Timer 0 Low byte SFR (TL0, 0x8A) are indeterminate

and should be ignored. Setting the run flag (TR0) does not clear

the registers.

Mode 1 (16-Bit Timer/Counter)

Mode 1 is the same as Mode 0 except that the Mode 1 timer

CONTROL

P0.6/T0

GATE

TR0

TF0

TL0

(8 BITS)

TH0

(8 BITS)

INTERRUPT

INT

C/ T = 0

C/ T = 1

FCORE

Figure 70. Timer/Counter 0, Mode 1

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