R8C/M11A Group, R8C/M12A Group

4. Electrical Characteristics

Specifications in this document are tentative and subject to change.

R01DS0010EJ0010 Rev.0.10

Page 39 of 45

Aug 25, 2010

Figure 4.10

Serial Interface Timing When Vcc = 3 V

Notes:

1. When the digital filter is enabled by the INTi input filter select bit, the INTi input high width is (1/digital filter clock frequency × 3)

or the minimum value of the standard, whichever is greater.

2. When the digital filter is enabled by the INTi input filter select bit, the INTi input low width is (1/digital filter clock frequency × 3)

or the minimum value of the standard, whichever is greater.

Figure 4.11

Timing for External Interrupt INTi Input and Key Input Interrupt KIi When Vcc = 3 V

Table 4.23

Serial Interface

Symbol

Parameter

Standard

Unit

Min.

Max.

CLK0 input cycle time

300

—

ns

CLK0 input high width

150

—

ns

CLK0 input low width

150

—

ns

TXD0 output delay time

—

80

ns

TXD0 hold time

0—

ns

RXD0 input setup time

70

—

ns

RXD0 input hold time

90

—

ns

Table 4.24

External Interrupt INTi Input, Key Input Interrupt KIi (i = 0 to 3)

Symbol

Parameter

Standard

Unit

Min.

Max.

INTi input high width, KIi input high width

380 (1)

—ns

INTi input low width, KIi input low width

380 (2)

—ns

Vcc = 3 V

CLK0

TXD0

RXD0

Vcc = 3 V

INTi input

KIi input

(i = 0 to 3)