MC908KX2MDWE Datasheet, PDF(175/210 Page) Freescale Semiconductor, Inc – High-performance M68HC08 architecture, Fully upward-compatible object code with M6805, M146805, and M68HC05 Families

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MC908KX2MDWE Datasheet, PDF (175/210 Pages) Freescale Semiconductor, Inc – High-performance M68HC08 architecture, Fully upward-compatible object code with M6805, M146805, and M68HC05 Families

◁

VDD

10 kâ¦

0.1 ÂµF

VTST

1 kâ¦

1

+

10 ÂµF

3

4

10 ÂµF

+2

DB-25

2

5

3

6

7

MC145407

20

+

10 ÂµF

18

17

+

10 ÂµF

VDD

19

0.1 ÂµF

VDD

0.1 ÂµF

9.8304-MHz

CANNED

OSCILLATOR

16

VDD

1

14

VDD

15

MC74HC125

2

3

10 kâ¦

6

5

4

7

Monitor ROM (MON)

68HC908KX8

RST (PTB7/OSC2)

IRQ1

VDD

VSS

OSC1

PTA0

PTB1 (PTXMOD1)

VDD

10 kâ¦

PTB0 (PTXMOD0)

PTA1 (SERIAL SELECT)

Figure 16-9. Normal Monitor Mode Circuit

$FFFE/ IRQ1

$FFFF Pin

X

VTST

$FF

blank

VDD

Table 16-1. Monitor Mode Entry

PTB1 Pin

(PTXMOD1)

PTB0 Pin PTA1 PTA0

(PTXMOD0) Pin Pin

CGMOUT

0

1

0

1

C-----G-----M-----X---C-----L---K---

2

X

X

0

1

C-----G-----M-----X---C-----L---K---

2

Bus

Frequency

(fOP)

C-----G----M------O----U----T---

2

C-----G----M------O----U----T---

2

MC68HC908KX8 â¢ MC68HC908KX2 â¢ MC68HC08KX8 Data Sheet, Rev. 2.1

Freescale Semiconductor

175

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