NEC PD75P402 Manual do Utilizador descarregar pdf (Página 71)

CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS

As the PCC is set in 0 by RESET input,

is reset-started at the slowest speed (state in which the operating voltage

range is wide). For this reason, in a system with a slow supply voltage rise (such as a system with a high- capacitance

capacitor connected), correct operation is possible even when an adequate supply voltage cannot be attained after

a power-on reset.

Table 5-5 Maximum Time Required for Change of CPU Clock

0010 1

0000

0011 1

0000 8

0010 15.3

0011 8

0000 16

0011

0010 16

PCC Before Change PCC After Change

Max. No. of Machine Cycles

Required for Change of

Max. Time Required for Change of

* (When fXX = 4.19 MHz)

* When standby mode is not set until

changes.

Fig. 5-15 Change of

after Power-On Reset

5V

0V

Supply

Voltage

RESET Input Signal

CPU

Operation

Oscillator

Stabilization

Time

Low-Speed

Operation

Progran

Start

Change (By Program)

High-Speed

Operation

Φ

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 194 195

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