UPD78F0550MA-FAA-AX Renesas Electronics America, UPD78F0550MA-FAA-AX Datasheet - Page 494

• Manufacturer Part Number: UPD78F0550MA-FAA-AX
• Description: MCU 8BIT 16-SSOP
• Manufacturer: Renesas Electronics America
• Series: 78K0/Kx2-Lr

Specifications of UPD78F0550MA-FAA-AX

• Package / Case: *
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Speed: 10MHz
• Number Of I /o: 12
• Core Processor: 78K/0
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Program Memory Size: 4KB (4K x 8)
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Peripherals: LVD, POR, PWM, WDT
• Connectivity: I²C, LIN, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

494
(3) Slave operation
The processing procedure of the slave operation is as follows.
Basically, the slave operation is event-driven. Therefore, processing by the INTIICA0 interrupt (processing that
must substantially change the operation status such as detection of a stop condition during communication) is
necessary.
In the following explanation, it is assumed that the extension code is not supported for data communication. It
is also assumed that the INTIICA0 interrupt servicing only performs status transition processing, and that
actual data communication is performed by the main processing.
Therefore, data communication processing is performed by preparing the following three flags and passing
them to the main processing instead of INTIICA0.
<1> Communication mode flag
<2> Ready flag
<3> Communication direction flag
This flag indicates the following two communication statuses.
This flag indicates that data communication is enabled. Its function is the same as the INTIICA0 interrupt
for ordinary data communication.
processing. Clear this flag by interrupt servicing when communication is started. However, the ready flag
is not set by interrupt servicing when the first data is transmitted. Therefore, the first data is transmitted
without the flag being cleared (an address match is interpreted as a request for the next data).
This flag indicates the direction of communication. Its value is the same as TRC0.
Clear mode:
Communication mode: Status in which data communication is performed (from valid address detection
IICA
INTIICA0
Setting
Status in which data communication is not performed
to stop condition detection, no detection of ACK from master, address
mismatch)
CHAPTER 15 SERIAL INTERFACE IICA
Preliminary User’s Manual U19111EJ2V1UD
This flag is set by interrupt servicing and cleared by the main
Interrupt servicing
Setting
Data
Flag
Main processing