HD64F2145 Datasheet, PDF (213/829 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

• P42/TMRI0/SCK2/SDA1
The pin function is switched as shown below according to the combination of the ICE bit in
ICCR of IIC1, the CKE1 and CKE0 bits in SCR of SCI_2, the C/$ bit in SMR of SCI_2, and
the P42DDR bit.
ICE
0
1
CKE1
0
1
0
C/$
0
1
—
0
CKE0
0
1
—
—
0
P42DDR
0
1
—
—
—
—
Pin Function P42 input P42 output SCK2 output SCK2 output SCK2 input SDA1
pin
pin
pin
pin
pin
I/O pin
TMRI0 input pin*
Note:* When this pin is used as the SDA1 I/O pin, bits CKE1 and CKE0 in SCR of SCI_2 and bit
C/$ in SMR of SCI_2 must all be cleared to 0. SDA1 is an NMOS-only output, and has
direct bus drive capability.
When bits CCLR1 and CCLR0 in TCR0 of TMR_0 are set to 1, this pin is used as the
TMRI0 input pin.
When the P42 output pin and SCK2 output pin are set, the output type is NMOS push-pull
output.
• P41/TMO0/RxD2/IrRxD
The pin function is switched as shown below according to the combination of the OS3 to OS0
bits in TCSR of TMR0, the RE bit in SCR of SCI_2 and the P41DDR bit.
OS3 to OS0
All 0
Not all 0
RE
0
1
0
P41DDR
0
1
—
—
Pin Function
P41
input pin
P41
output pin
RxD2/IrRxD
input pin
TMO0
output pin
Note:* When this pin is used as the TMO0 output pin, bit RE in SCR of SCI_2 must be cleared to
0.
Rev. 2.0, 08/02, page 173 of 788