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| 型號： | ADE7169F16 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Single-Phase Energy Measurement IC with 8052 MCU, RTC and LCD driver |
| 中文描述： | 單相電能計量集成電路8052微控制器，RTC和LCD驅(qū)動器 |
| 文件頁數(shù)： | 107/140頁 |
| 文件大小： | 1359K |
| 代理商： | ADE7169F16 |
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Preliminary Technical Data
ADE7169F16
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 71. 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.
Rev. PrD | Page 107 of 140
CONTROL
TF0
TL0
(8 BITS)
INTERRUPT
RELOAD
TH0
(8 BITS)
P0.6/T0
GATE
TR0
0
0
INT
C/T = 0
C/T = 1
F
CORE
Figure 71. 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 72.
TL0 uses the Timer 0 control bits C/T, Gate, TR0, INT0, and
TF0. TH0 is locked into a timer function (counting machine
cycles) and takes over the use of TR1 and TF1 from Timer 1.
Therefore, TH0 then 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 still be
used by the serial interface as a baud rate generator. In fact, it
can be used in any application not requiring an interrupt from
Timer 1 itself.
CONTROL
CORE
CLK/12
TF0
(8TL0
INTERRUPT
P0.6/T0
GATE
INT
TR0
TF1
TH0
(8 BITS)
INTERRUPT
F
CORE
/
12
TR1
0
0
C/T = 0
C/T = 1
F
CORE
Figure 72. Timer/Counter 0, Mode 3
TIMER 2
Timer/Counter 2 Data Registers
Timer/Counter 2 also has two pairs of 8-bit data registers
associated with it: Timer 2 High byte SFR (TH2, 0xCD), Timer
2 Low byte SFR (TL2, 0xCC), Timer 2 Reload/capture High byte
SFR (RACP2H, 0xCB) and Timer 2 Reload/capture Low byte
SFR (RACP2L, 0xCA). These are used as both timer data
registers and as timer capture/reload registers – see Table 101 to
Table 104.
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, 0xC8) as shown in
Table 96 and Table 105.
Table 105. T2CON Operating Modes
RCLK (or) TCLK
CAP2
TR2
0
0
1
0
1
1
1
X
1
X
X
0
Mode
16-Bit Autoreload
16-Bit Capture
Baud Rate
Off
16-Bit Autoreload Mode
Autoreload mode has two options that are selected by bit
EXEN2 in Timer/Counter 2 Control SFR (T2CON, 0xC8). If
EXEN2 = 0, when Timer 2 rolls over, it not only sets TF2 but
also causes the Timer 2 registers to be reloaded with the 16-bit
value in registers Timer 2 Reload/capture High byte SFR
(RACP2H, 0xCB) and Timer 2 Reload/capture Low byte SFR
(RACP2L, 0xCA), which are preset by software. If EXEN2 = 1,
Timer 2 still performs the above, but with the added feature that
a 1-to-0 transition at external input T2EX also triggers the 16-
bit reload and sets EXF2. Autoreload mode is shown in Figure
73.
16-Bit Capture Mode
Capture mode has two options that are selected by Bit EXEN2
in T2CON. If EXEN2 = 0, Timer 2 is a 16-bit timer or counter
that, upon overflowing, sets bit TF2, the Timer 2 overflow bit,
which can be used to generate an interrupt. If EXEN2 = 1,
Timer 2 still performs the above, but a l-to-0 transition on
external input T2EX causes the current value in the Timer 2
registers, TL2 and TH2, to be captured into registers RCAP2L
and RCAP2H, respectively. In addition, the transition at T2EX
causes bit EXF2 in T2CON to be set, and EXF2, like TF2, can
generate an interrupt. Capture mode is shown in Figure 74. The
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