
126
Rev. 1.0
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
with DATA ACQUISITION CONTROLLER
MITSUBISHI MICROCOMPUTERS
M306H2FCFP
P70/TxD2/SDA
P71/RxD2/SCL
CLK
control
P72/CLK2
Falling edge
detection
UART2 reception/ACK interrupt
request, DMA1 request
To DMA0, DMA1
To DMA0
I/O
Timer
UART2
Timer
UART2
IICM=1 (SDDS=0) or
DL=000 (SDDS=1)
IICM=0
or IICM2=1
IICM=1
and IICM2=0
SDHI
Noize
Filter
Timer
UART2
I/O
D
T
Q
D
T
Q
D
T
Q
NACK
ACK
UART2
IICM=1
IICM=0
IICM=1
IICM=0
S
R
Q
IICM=1
IICM=0
I/O
R
Q
ALS
IICM=0 or
DL 000 (SDDS=1)
SDDS=0
or DL=000
SDDS=1 and
DL 000
SWC2
Falling edge of 9 bit
SWC
IICM=1
and IICM2=0
IICM=0
or IICM2=1
Selector
Noize
Filter
Noize
Filter
*
With IICM set to 1, the port terminal is to be readable
even if 1 is assigned to P7 1 of the direction register.
Port reading
External clock
Internal clock
9th pulse
Bus collision
detection
Bus collision/start, stop condition
detection interrupt request
UART2 transmission/
NACK interrupt request
Start condition
detection
Stop condition
detection
L-synchronous
output enabling
bit
(Port P71 output data latch)
Data bus
Reception register
Bus busy
Transmission
register
Arbitration
Analog
delay
Digital delay
(Divider)
P70 through P72 conforming to the simplified I2C bus
Figure 2.11.30 Functional block diagram for I2C mode
Functions available in I2C mode are shown in Figure 2.11.30— a functional block diagram.
Bit 3 of the UART2 special mode register 2 (address 037616) is used as the SDA output stop bit.
Setting this bit to "1" causes an arbitration loss to occur, and the SDA pin turns to high-impedance
state the instant when the arbitration loss detection flag is set to "1".
Bit 1 of the UART2 special mode register 2 (address 037616) is used as the clock synchronization bit.
With this bit set to "1" at the time when the internal SCL is set to "H", the internal SCL turns to "L" if the
falling edge is found in the SCL pin; and the baud rate generator reloads the set value, and start
counting within the "L" interval. When the internal SCL changes from "L" to "H" with the SCL pin set to
"L", stops counting the baud rate generator, and starts counting it again when the SCL pin turns to "H".
Due to this function, the UART2 transmission-reception clock becomes the logical product of the
signal flowing through the internal SCL and that flowing through the SCL pin. This function operates
over the period from the moment earlier by a half cycle than falling edge of the UART2 first clock to the
rising edge of the ninth bit. To use this function, choose the internal clock for the transfer clock.
Bit 2 of the UART2 special mode register 2 (037616) is used as the SCL wait output bit. Setting this bit
to "1" causes the SCL pin to be fixed to "L" at the falling edge of the ninth bit of the clock. Setting this
bit to "0" frees the output fixed to "L".