r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 510

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
Figure 23.13
SDA2
SCL2
IICM: Bit in U2SMR register
IICM2, SWC, SWC2, SDHI: Bits in U2SMR2 register
STSPSEL, ACKD, ACKC: Bits in U2SMR4 register
The above applies when:
Note:
• Bits SMD2 to SMD0 in U2MR register = 010b
• IICM bit in U2SMR register = 1
If the IICM bit is set to 1, the pin can be read even when the port direction bit corresponding to the SCL2 pin is set to 1 (output mode).
Noise
filter
Noise
filter
I
ACKC = 1
2
Delay
circuit
C Mode Block Diagram
IICM = 0
IICM = 1
ACKD bit
UART2
STSPSEL = 0
Stop condition
detection
I/O port
STSPSEL = 0
Start condition
detection
STSPSEL = 1
ACKC = 0
STSPSEL
Q
R
= 1
SDHI
Port register
Internal clock
External
clock
SWC2
R
S
(1)
S
R
CLK
control
Start/stop condition generation block
Q
SDA (STSP)
SCL (STSP)
9th bit falling edge
Transmit
register
Bus
busy
UART2
UART2
Receive
register
UART2
SWC
9th bit
D
D
T
T
Q
Q
IICM2 = 1
ACK
IICM = 1 and
IICM2 = 0
IICM2 = 1
IICM = 1 and
IICM2 = 0
NACK
23. Serial Interface (UART2)
DTC request
(source number 15)
UART2 transmit/NACK
interrupt request
UART2 receive/ACK
interrupt request
DTC request
(source number 14)
Start/stop condition detection
interrupt request
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