CXP81960 Ver la hoja de datos (PDF) - Sony Semiconductor

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componentes Descripción

Fabricante

CXP81960

CMOS 8-bit Single Chip Microcomputer

Sony Semiconductor 

CXP81952/81960

AC Characteristics

(1) Clock timing

(Ta = –20 to +75°C, VDD = 3.0 to 5.5V, Vss = 0V)

Item

Symbol Pins

Conditions

Min. Max. Unit

System clock frequency fC

System clock input

tXL,

pulse width

tXH

System clock input

tCR,

rise and fall times

tCF

Event count clock input tEH,

pulse width

tEL

Event count clock input tER,

rise and fall times

tEF

XTAL

EXTAL

XTAL

EXTAL

Fig. 1,

VDD = 4.5 to 5.5V

Fig. 2

Fig. 1,

VDD = 4.5 to 5.5V

Fig. 2 (External clock drive)

1

1

28

37.5

XTAL Fig. 1, Fig. 2

EXTAL (External clock drive)

16 MHz

12

ns

200 ns

EC

Fig. 3

tsys × 4∗

ns

EC

Fig. 3

20 ns

System clock frequency fC

TEX Fig. 2 VDD = 2.7 to 5.5V

TX

(32kHz clock applied condition)

32.768

kHz

Event count clock input tTL,

pulse width

tTH

TEX Fig. 3

10

µs

Event count clock input tTR,

rise and fall times

tTF

TEX

Fig. 3

20 ms

∗ tsys indicates three values according to the contents of the clock control register (address; 00FEH) upper 2

bits (CPU clock selection).

tsys [ns] = 2000/fc (Upper 2 bits = "00"), 4000/fc (Upper 2 bits = "01"), 16000/fc (Upper 2 bits = "11")

Fig. 1. Clock timing

1/fc

EXTAL

VDD – 0.4V

0.4V

Fig. 2. Clock applied condition

Crystal oscillation

Ceramic oscillation

tXH

tCF

External clock

tXL

tCR

32kHz clock applied condition

crystal oscillation

EXTAL XTAL

C1

C2

EXTAL XTAL

74HC04

TEX

C1

TX

C2

Fig. 3. Event count clock timing

TEX

EC

tEH

tTH

tEF

tEL

tTF

tTL

– 17 –

0.8VDD

0.2VDD

tER

tTR

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