UPD754304GSA-XXX View Datasheet(PDF) - NEC => Renesas Technology

Part Name

Description

Manufacturer

UPD754304GSA-XXX

4-BIT SINGLE-CHIP MICROCONTROLLER

NEC => Renesas Technology 

µPD754302, 754304, 754302(A), 754304(A)

6.2 Clock Generator

• Clock generator configuration

The clock generator provides the clock signals to the CPU and peripheral hardware and its configuration

is shown in Figure 6-1.

The operation of the clock generator is set with the processor clock control register (PCC).

The instruction execution time can be changed.

• 0.95, 1.91, 3.81, 15.3 µs (system clock operating at 4.19 MHz)

• 0.67, 1.33, 2.67, 10.7 µs (system clock operating at 6.0 MHz)

Figure 6-1. Clock Generator Block Diagram

X1

System

fX

clock oscillator

X2

Oscillation

stop

PCC

PCC0

PCC1

4

PCC2

HALTNote

PCC3

STOPNote

· Basic interval timer (BT)

· Timer/event counters 0, 1

· Serial interface

· INT0 noise eliminator

· Clock output circuit

1/2 1/4 1/16

1/1 to 1/4096

Divider

Selector

Divider

1/4

Φ

· CPU

· INT0 noise eliminator

· Clock output circuit

HALT F/F

S

RQ

PCC2,

PCC3

Clear

STOP F/F

QS

R

Note Instruction execution

Wait signal from BT

RESET signal

Standby release signal from

interrupt control circuit

Remarks 1.

2.

3.

4.

fX = System clock frequency

Φ = CPU clock

PCC: Processor Clock Control Register

One clock cycle (tCY) of the CPU clock is equal to one machine cycle of the instruction.

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