UPD780964 Просмотр технического описания (PDF) - NEC => Renesas Technology

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UPD780964

8-BIT SINGLE-CHIP MICROCOMPUTER

NEC => Renesas Technology 

µPD780016Y, 780018Y

5.2 Clock Generator

There are two kinds of clock generators: main system and subsystem clock generators.

It is possible to change the instruction execution time.

• 0.4 µs/0.8 µs/1.6 µs/3.2 µs/6.4 µs (at main system clock frequency of 5.0 MHz)

• 122 µs (at subsystem clock frequency of 32.768 kHz)

Figure 5-1. Clock Generator Block Diagram

XT1

Subsystem fXT

clock

XT2

oscillator

X1

Main system fX

clock

X2

oscillator

Division

circuit fX

2

STOP

MCSNote

Oscillation mode

select register

Note Be sure to set 1 to MCS.

fXX

fXX

2

Prescaler

fXX fXX fXX

22 23 24

12

fXT

2

Prescaler

Watch timer, Clock

output function

Clock to peripheral

hardware

Standby

control

circuit

Wait

control

circuit

CPU clock

(fCPU)

To INTP0

sampling clock

5.3 Timer/Event Counter

There are the following seven timer/event counter channels:

• 16-bit timer/event counter : 1 channel

• 8-bit timer/event counter : 4 channels

• Watch timer

: 1 channel

• Watchdog timer

: 1 channel

Table 5-2. Types and Functions of Timer/Event Counters

16-bit Timer/Event 8-bit Timer/Event 8-bit Timer/Event

Counter

Counters 1, 2

Counters 5, 6 Watch Timer Watchdog Timer

Type

Interval timer

External event counter

1 channel

1 channel

2 channels

2 channels

2 channels

2 channels

1 channel

—

1 channel

—

Timer output

1 output

2 outputs

2 outputs

—

—

PWM output

1 output

—

2 outputs

—

—

Pulse width measurement

2 inputs

—

Function

—

—

—

Square wave output

1 output

2 outputs

2 outputs

—

—

One-shot pulse output

1 output

—

—

—

—

Interrupt request

2

2

2

1

1

Test input

—

—

—

1 input

—

18

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