UPD78F0034BGC-8BS-A Renesas Electronics America, UPD78F0034BGC-8BS-A Datasheet - Page 375

• Manufacturer Part Number: UPD78F0034BGC-8BS-A
• Description: MCU 8-Bit 78K0 CISC 32KB Flash 2.5V/3.3V/5V 64-Pin LQFP
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0034BGC-8BS-A

• Package: 64LQFP
• Family Name: 78K0
• Maximum Speed: 12 MHz
• Ram Size: 1 KB
• Program Memory Size: 32 KB
• Operating Supply Voltage: 2.5|3.3|5 V
• Data Bus Width: 8 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 51
• Interface Type: 3-Wire/UART
• On-chip Adc: 8-chx10-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 3

The main processing of the slave operation is explained next.
Start serial interface IIC0 and wait until communication is enabled. When communication is enabled, execute
communication by using the communication mode flag and ready flag (processing of the stop condition and start
condition is performed by an interrupt. Here, check the status by using the flags).
The transmission operation is repeated until the master no longer returns ACK. If ACK is not returned from the
master, communication is completed.
For reception, the necessary amount of data is received. When communication is completed, ACK is not returned
as the next data. After that, the master issues a stop condition or restart condition. Exit from the communication
status occurs in this way.
No
No
CHAPTER 18 SERIAL INTERFACE IIC0 ( PD780024AY, 780034AY SUBSERIES ONLY)
Clear communication mode flag.
Communication mode?
Communication mode?
Data processing
Clear ready flag.
direction flag = 1?
Communication
IICC0
ACKD0 = 1?
IIC0
WTIM0 = 1
WREL0 = 1
IICE0 = 1
Ready?
START
Yes
Yes
Yes
Yes
Yes
data
Figure 18-22. Slave Operation Flowchart (1/2)
H
No
No
No
User’s Manual U14046EJ5V0UD
No
No
ACKE0 = WTIM0 = 1
Communication mode?
Communication ends?
Clear ready flag.
Data processing
WREL0 = 1
WREL0 = 1
ACKE0 = 0
Read data.
Ready?
Yes
Yes
Yes
No
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