UPD75068CUA データシートの表示（PDF） - NEC => Renesas Technology

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UPD75068CUA

4-BIT SINGLE-CHIP MICROCOMPUTER

NEC => Renesas Technology 

µPD75064, 75066, 75068, 75064(A), 75066(A), 75068(A)

5.6 Timer/Event Counter

The µPD75068 has an on-chip 1-ch timer/event counter. The timer/event counter has the following

functions:

• Programmable interval timer operation

• Outputs square-wave signal of a user-selectable frequency to the PTO0 pin

• Event counter operation

• Divides the TI0 pin input by N and outputs to the PTO0 pin (frequency divider operation)

• Supplies serial shift clock to the serial interface circuit

• Count condition read-out function.

Figure 5-5. Block Diagram of Timer / Event Counter

Internal bus

8

SET1 Note

8

TM0

TM07 TM06 TM05 TM04 TM03 TM02 TM01 TM00

8

TMOD0

Modulo register (8)

TOE0

TO

enable

flag

PORT1.3

Input buffer

P13/

TI0



From the 

clock



generator 



(Refer to Fig. 5-1.)

MPX

8

Comparator (8)

Match

TOUT

F/F

8

T0

Reset

Count register (8)

CP

Clear

signal

Timer operation start signal

PORT2.0

P20

output

latch

signal

Bit 2 of PGMB

Port 2

input/

output

mode

To serial

interface

Output

buffer

P20/PTO0

INTT0

IRQT0

set signal

RESET

IRQT0 clear

signal

Note Instruction execution

23

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