ade7566 Analog Devices, Inc., ade7566 Datasheet - Page 73

• Manufacturer Part Number: ade7566
• Description: Single-phase Energy Measurement Ic With 8052 Mcu, Rtc, And Lcd Driver
• Manufacturer: Analog Devices, Inc.

STANDARD 8052 SFRS
The standard 8052 special function registers include the
Accumulator, B, PSW, DPTR, and SP SFRs described in the
Basic 8052 Registers section. The standard 8052 SFRs also
define timers, the serial port interface, interrupts, I/O ports,
and power-down modes.
Timer SFRs
The 8052 contains three 16-bit timers: the identical Timer0 and
Timer1, as well as a Timer2. These timers can also function as
event counters. Timer2 has a capture feature where the value of
the timer can be captured in two 8-bit registers upon the
assertion of an external input signal (see Table 100 and the
Timers section).
Serial Port SFRs
The full-duplex serial port peripheral requires two registers,
one for setting up the baud rate and other communication
parameters, and another for the transmit/receive buffer. The
ADE7566/ADE7569 also have enhanced serial port functionality
with a dedicated timer for baud rate generation with a fractional
divisor and additional error detection. See Table 129 and the
UART Serial Interface section.
Interrupt SFRs
There is a two-tiered interrupt system standard in the 8052 core.
The priority level for each interrupt source is individually selectable
as high or low. The ADE7566/ADE7569 enhance this interrupt
system by creating, in essence, a third interrupt tier for a highest
priority, the power supply management interrupt (PSM). See
the Interrupt System section.
I/O Port SFRs
The 8052 core supports four I/O ports, Port 0 through Port 3,
where Port 0 and Port 2 are typically used to access external
code and data spaces. The ADE7566/ADE7569, unlike standard
8052 products, provide internal nonvolatile flash memory so
that an external code space is unnecessary. The on-chip LCD
driver requires many pins, some of which are dedicated for LCD
functionality, and others that can be configured as LCD or
general-purpose inputs/outputs. Due to the limited number of
I/O pins, the ADE7566/ADE7569 do not allow access to
external code and data spaces.
The ADE7566/ADE7569 provide 20 pins that can be used for
general-purpose I/O. These pins are mapped to Port 0, Port 1,
and Port 2. They are accessed through three bit-addressable
8052 SFRs, P0, P1, and P2. Another enhanced feature of the
ADE7566/ADE7569 is that the weak pull-ups standard on 8052
Port 1, Port 2, and Port 3 can be disabled to make open drain
outputs, as is standard on Port 0. The weak pull-ups can be
enabled on a pin-by-pin basis. See the I/O Ports section.
Rev. 0 | Page 73 of 136
Program Control Register (PCON, 0x87)
The 8052 core defines two power-down modes: power down
and idle. The ADE7566/ADE7569 enhance the power control
capability of the traditional 8052 MCU with additional power
management functions. The Power Control SFR (POWCON,
0xC5) is used to define power control-specific functionality for
the ADE7566/ADE7569. The Program Control SFR (PCON, 0x87)
is not bit addressable. See the Power Management section.
The ADE7566/ADE7569 have many other peripherals not
standard to the 8052 core, including
•
•
•
•
•
•
•
•
•
MEMORY OVERVIEW
The ADE7566/ADE7569 contain the following memory blocks:
•
•
•
The 256 bytes of general-purpose RAM share the upper 128 bytes
of its address space with special function registers. All of the
memory spaces are shown in Figure 75. The addressing mode
specifies which memory space to access.
General-Purpose RAM
General-purpose RAM resides in the 0x00 through 0xFF
memory locations. It contains the register banks.
BITS IN PSW
SELECTED
ADE energy measurement DSP
RTC
LCD driver
Battery switchover/power management
Temperature ADC
Battery ADC
SPI/I
Flash memory controller
Watchdog timer
16 kB of on-chip Flash/EE program and data memory
256 bytes of general-purpose RAM
256 bytes of internal extended RAM (XRAM)
BANKS
VIA
2
Figure 77. Lower 128 Bytes of Internal Data Memory
C communication
11
10
01
00
0x30
0x20
0x18
0x10
0x08
0x 00
0x7F
0x2F
0x1F
0x17
0x0F
0x07
ADE7566/ADE7569
FOUR BANKS OF EIGHT
REGISTERS R0 TO R7
BIT-ADDRESSABLE
(BIT ADDRESSES)
GENERAL-PURPOSE
AREA
RESET VALUE OF
STACK POINTER