R8C/M13B Group

4. Electrical Characteristics

R01DS0005EJ0100 Rev.1.00

Page 39 of 48

Mar 14, 2011

i = 0 or 1

Figure 4.10

Serial Interface Timing When Vcc = 5 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 = 5 V

Table 4.19

Serial Interface

Symbol

Parameter

Standard

Unit

Min.

Max.

CLKi input cycle time

200

—

ns

CLKi input high width

100

—

ns

CLKi input low width

100

—

ns

TXDi output delay time

—

50

ns

TXDi hold time

0—

ns

RXDi input setup time

50

—

ns

RXDi input hold time

90

—

ns

Table 4.20

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

250 (1)

—ns

INTi input low width, KIi input low width

250 (2)

—ns

Vcc = 5 V

CLKi

TXDi

RXDi

i = 0 or 1

Vcc = 5 V

INTi input

KIi input

(i = 0 to 3)