R5F21334CNFP#U0 Renesas Electronics America, R5F21334CNFP#U0 Datasheet - Page 444

• Manufacturer Part Number: R5F21334CNFP#U0
• Description: MCU 1KB FLASH 16K ROM 32-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/33Cr

Specifications of R5F21334CNFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, PWM, Voltage Detect, WDT
• Number Of I /o: 27
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 12x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 32-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/33C Group
REJ09B0570-0100 Rev.1.00 Dec. 14, 2009
Page 414 of 589
25.2.10 IIC bus Status Register (ICSR)
Notes:
After Reset
1. Each bit is set to 0 by reading 1 before writing 0.
2. This flag is enabled in slave receive mode with the I
3. When two or more master devices attempt to occupy the bus at nearly the same time, if the I
4. The NACKF bit is enabled when the ACKE bit in the ICIER register is set to 1 (when the receive acknowledge bit
5. The RDRF bit is set to 0 when data is read from the ICDRR register.
6. Bits TEND and TDRE are set to 0 when data is written to the ICDRT register.
Bit
b0
b1
b2
b3
b4
b5
b6
b7
Address 019Ch
monitors the SDA pin and the data which the I
the bus is occupied by another master.
is set to 1, transfer is halted).
When accessing the ICSR register continuously, insert one or more NOP instructions between the instructions
to access it.
Symbol
Symbol
NACKF No acknowledge
Bit
STOP
RDRF
TEND
TDRE
ADZ
AAS
AL
TDRE
b7
0
General call address
recognition flag
Slave address
recognition flag
Arbitration lost flag/overrun
error flag
Stop condition detection flag
detection flag
Receive data register full flag
(1, 5)
Transmit end flag
Transmit data empty flag
TEND
b6
(1)
0
Bit Name
(1, 4)
(1, 2)
(1)
RDRF
(1, 6)
b5
0
(1, 6)
NACKF
(1)
b4
0
This flag is set to 1 when a general call address is
detected.
This flag is set to 1 when the first frame immediately after
the start condition matches bits SVA0 to SVA6 in the SAR
register in slave receive mode (slave address detection
and general call address detection)
I
This flag indicates that arbitration has been lost
in master mode.
This flag is set to 1
Clock synchronous format:
This flag indicates an overrun error.
This flag is set to 1 when:
This flag is set to 1 when a stop condition is detected
after the frame is transferred.
This flag is set to 1 when no ACKnowledge is detected
from the receive device after transmission.
This flag is set to 1 when receive data is transferred from
registers ICDRS to ICDRR.
I
This flag is set to 1 at the rising edge of the 9th clock cycle
of the SCL signal while the TDRE bit is set to 1.
Clock synchronous format:
This flag is set to 1 when the last bit of the transmit frame
is transmitted.
This flag is set to 1 when:
2
2
2
• The internal SDA signal and SDA pin level do not
• The SDA pin is held “H” at start condition detection in
• The last bit of the next unit of data is received
• Data is transferred from registers ICDRT to ICDRS and
• The TRS bit in the ICCR1 register is set to 1 (transmit
• A start condition is generated (including retransmission)
• Slave receive mode is changed to slave transmit mode
C bus format:
C bus format:
C bus Interface transmits is different, the AL flag is set to 1 and
match at the rising edge of the SCL signal in master
transmit mode
master transmit/receive mode
while the RDRF bit is set to 1
the CDRT register is empty
mode)
2
C bus format.
STOP
b3
X
(3)
AL
b2
0
when:
Function
AAS
b1
0
ADZ
b0
0
25. I
2
C bus Interface
2
C bus Interface
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W