ATMEGA164P-20MQ Atmel, ATMEGA164P-20MQ Datasheet - Page 219
![MCU AVR 16K FLASH 20MHZ 44-QFN](/photos/12/13/121316/313-44-qfn_sml.jpg)
ATMEGA164P-20MQ
Manufacturer Part Number
ATMEGA164P-20MQ
Description
MCU AVR 16K FLASH 20MHZ 44-QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA164P-20MQ
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
16KB (8K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-VQFN Exposed Pad
For Use With
ATSTK600-TQFP44 - STK600 SOCKET/ADAPTER 44-TQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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18.7.1
8011O–AVR–07/10
Master Transmitter Mode
SLA: Slave Address
In
TWINT Flag is set. The numbers in the circles show the status code held in TWSR, with the
prescaler bits masked to zero. At these points, actions must be taken by the application to con-
tinue or complete the TWI transfer. The TWI transfer is suspended until the TWINT Flag is
cleared by software.
When the TWINT Flag is set, the status code in TWSR is used to determine the appropriate soft-
ware action. For each status code, the required software action and details of the following serial
transfer are given in
bits are masked to zero in these tables.
In the Master Transmitter mode, a number of data bytes are transmitted to a Slave Receiver
(see
transmitted. The format of the following address packet determines whether Master Transmitter
or Master Receiver mode is to be entered. If SLA+W is transmitted, MT mode is entered, if
SLA+R is transmitted, MR mode is entered. All the status codes mentioned in this section
assume that the prescaler bits are zero or are masked to zero.
Figure 18-11. Data Transfer in Master Transmitter Mode
A START condition is sent by writing the following value to TWCR:
TWEN must be set to enable the 2-wire Serial Interface, TWSTA must be written to one to trans-
mit a START condition and TWINT must be written to one to clear the TWINT Flag. The TWI will
then test the 2-wire Serial Bus and generate a START condition as soon as the bus becomes
free. After a START condition has been transmitted, the TWINT Flag is set by hardware, and the
status code in TWSR will be 0x08 (see
SLA+W must be transmitted. This is done by writing SLA+W to TWDR. Thereafter the TWINT bit
should be cleared (by writing it to one) to continue the transfer. This is accomplished by writing
the following value to TWCR:
When SLA+W have been transmitted and an acknowledgement bit has been received, TWINT is
set again and a number of status codes in TWSR are possible. Possible status codes in Master
TWCR
value
TWCR
value
Figure 18-12 on page 221
Figure 18-11 on page
SDA
SCL
TWINT
TWINT
1
1
TRANSMITTER
Table 18-2 on page 220
Device 1
MASTER
TWEA
TWEA
X
X
219). In order to enter a Master mode, a START condition must be
to
Device 2
RECEIVER
Figure 18-18 on page
SLAVE
TWSTA
TWSTA
1
0
Table 18-2 on page
Device 3
to
TWSTO
TWSTO
Table 18-5 on page
0
0
ATmega164P/324P/644P
........
230, circles are used to indicate that the
TWWC
TWWC
Device n
X
X
220). In order to enter MT mode,
V
CC
TWEN
TWEN
229. Note that the prescaler
1
1
R1
R2
–
0
–
0
TWIE
TWIE
X
X
219
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