ATTINY88-15MZ Atmel, ATTINY88-15MZ Datasheet - Page 22

• Manufacturer Part Number: ATTINY88-15MZ
• Description: IC MCU AVR 8B 8KB FLASH 32QFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY88-15MZ

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 28
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 64 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.4
5.4.1
5.5
5.5.1
22
I/O Memory
Register Description
ATtiny88 Automotive
General Purpose I/O Registers
EEARH and EEARL – EEPROM Address Register
The I/O space definition of the ATtiny88 is shown in
All ATtiny88 I/Os and peripherals are placed in the I/O space. All I/O locations may be accessed
by the LD/LDS/LDD and ST/STS/STD instructions, transferring data between the 32 general
purpose working registers and the I/O space. I/O Registers within the address range 0x00 –
0x1F are directly bit-accessible using the SBI and CBI instructions. In these registers, the value
of single bits can be checked by using the SBIS and SBIC instructions. Refer to the instruction
set section for more details. When using the I/O specific commands IN and OUT, the I/O
addresses 0x00 – 0x3F must be used. When addressing I/O Registers as data space using LD
and ST instructions, 0x20 must be added to these addresses. The ATtiny88 is a complex micro-
controller with more peripheral units than can be supported within the 64 location reserved in
Opcode for the IN and OUT instructions. For the Extended I/O space from 0x60 – 0xFF in
SRAM, only the ST/STS/STD and LD/LDS/LDD instructions can be used.
For compatibility with future devices, reserved bits should be written to zero if accessed.
Reserved I/O memory addresses should never be written.
Some of the Status Flags are cleared by writing a logical one to them. Note that the CBI and SBI
instructions will only operate on the specified bit, and can therefore be used on registers contain-
ing such Status Flags. The CBI and SBI instructions work with registers 0x00 to 0x1F only.
The I/O and peripherals control registers are explained in later sections.
ATtiny88 contains three General Purpose I/O Registers. These registers can be used for storing
any information, and they are particularly useful for storing global variables and Status Flags.
General Purpose I/O Registers within the address range 0x00 – 0x1F are directly bit-accessible
using the SBI, CBI, SBIS, and SBIC instructions.
• Bits 15..6 – Res: Reserved Bits
These bits are reserved and will always read zero.
• Bits 5..0 – EEAR5..0: EEPROM Address
The EEPROM Address Registers – EEARH and EEARL specify the EEPROM address in the 64
bytes EEPROM space. The EEPROM data bytes are addressed linearly between 0 and 63. The
initial value of EEAR is undefined. A proper value must be written before the EEPROM may be
accessed.
Bit
Read/Write
Initial Value
15
R
R
–
7
0
0
-
14
–
6
R
R
0
0
-
EEAR5
R/W
13
R
X
–
5
0
EEAR4
R/W
12
R
X
–
4
0
EEAR3
“Register Summary” on page
R/W
11
R
–
3
0
X
EEAR2
R/W
10
R
X
–
2
0
EEAR1
R/W
R
X
9
–
1
0
EEAR0
R/W
R
X
8
0
0
-
230.
9157B–AVR–01/10
EEARH
EEARL