p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 404

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 16 I
• Direct bus drive (SCL/SDA pin)
Figure 16.1 shows a block diagram of the I
pin connections to external circuits. Since I
normal port pins, they have different specifications for permissible applied voltages. For details,
see section 24, Electrical Characteristics.
Rev. 1.00 Sep. 21, 2006 Page 366 of 658
REJ09B0310-0100
 Two pins—P52/SCL0 and P47/SDA0—(normally NMOS push-pull outputs) function as
 Two pins—P24/SCL1 and P23/SDA1—(normally CMOS pins) function as NMOS outputs
NMOS open-drain outputs when the bus drive function is selected.
when the bus drive function is selected. Voltage exceeding Vcc cannot be applied.
φ
SCL
SDA
2
C Bus Interface (IIC)
[Legend]
ICCR:
ICMR:
ICSR:
ICDR:
ICXR:
SAR:
SARX:
PS:
canceler
canceler
Noise
Noise
I
I
I
I
I
Slave address register
Slave address register X
Prescaler
2
2
2
2
2
PS
C bus control register
C bus mode register
C bus status register
C bus data register
C bus extended control register
Figure 16.1 Block Diagram of I
Output data
Arbitration
Bus state
decision
control
decision
Clock
control
circuit
circuit
circuit
2
2
C bus interface. Figure 16.2 shows an example of I/O
C bus interface I/O pins are different in structure from
2
C Bus Interface
SAR, SARX
comparator
generator
Address
Interrupt
ICDRS
ICDRR
ICDRT
ICMR
ICXR
ICCR
ICSR
Interrupt
request