Maxim-integrated MAXQ Family Users Guide: MAXQ2000 Supplement Uživatelský manuál stáhnout pdf (Strana 11)

MAXQ Family User’s Guide:

MAXQ2000 Supplement

Clock Generation

All functional modules in the MAXQ2000 are synchronized to a single system clock. This system clock can be generated from one of

five possible sources (Figure 5):

• Internal ring oscillator

• Internal high-frequency oscillator using external crystal or resonator circuit

• External high-frequency clock signal

• Internal 32kHz oscillator using external crystal or resonator circuit

• External 32kHz clock signal

The MAXQ2000 does not provide the option for an external RC relaxation oscillator circuit.

Table 1 shows the registers and bits used to control clock generation and selection. For more information, see the register descriptions

in this guide and the MAXQ Family User’s Guide.

32k x 16

PROGRAM FLASH

OR MASKED ROM

PROGRAM

SPACE

EXECUTING FROM

DATA SPACE

(BYTE MODE)

DATA SPACE

(WORD MODE)

0000h

7FFFh

2k x 16

UTILITY ROM

87FFh

1k x 16

DATA SRAM

A000h

8000h

A3FFh

4k x 8

UTILITY ROM

8FFFh

8000h

64k x 8

PROGRAM FLASH

OR MASKED ROM

PAGE 0

(IF CDA0 = 0)

PAGE 1

(IF CDA0 = 1)

0000h

7FFFh

2k x 16

UTILITY ROM

87FFh

8000h

32k x 16

PROGRAM FLASH

OR MASKED ROM

PAGES 0 AND 1

0000h

7FFFh

Figure 4. Memory Map When Executing from Data SRAM

Maxim Integrated

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 92 93

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