Ibm uPD78082 Manual do Utilizador descarregar pdf (Página 99)

CHAPTER 5 CLOCK GENERATOR

5.5 Clock Generator Operations

The clock generator generates the following various types of clocks and controls the CPU operating mode

including the standby mode.

• Main system clock fXX

• CPU clock fCPU

• Clock to peripheral hardware

The following clock generator functions and operations are determined with the processor clock control register

(PCC) and the oscillation mode selection register (OSMS).

(a) Upon generation of RESET signal, the lowest speed mode of the main system clock (12.8

s when operated

at 5.0 MHz) is selected (PCC = 04H, OSMS = 00H). Main system clock oscillation stops while low level is

applied to RESET pin.

(b) The six types of CPU clocks (0.4

s. 0.8

s, 1.6

s, 3.2

s, 6.4

s, 12.8

s : 5.0 MHz) can be selected by setting

the PCC and OSMS.

(d) The main system clock is divided and supplied to the peripheral hardware. Thus, the peripheral hardware

also stops if the main system clock is stopped. (Except external input clock operation)

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Ibm uPD78082 Manual do Utilizador Página 99