TS68HC901 查看數據表（PDF） - STMicroelectronics

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TS68HC901

HCMOS MULTI-FUNCTION PERIPHERAL

STMicroelectronics 

TS68HC901

Figure 6 :

V7

V6

V5

V4

IV3

IV2

IV1

IV0

V7-V4

IV3-IV0

The four most significant bits are copied from the register

These bits are supplied by the CMFP. They are the binary channel number of the highest

priority channel that is requesting interrupt service.

Figure 7 :

7

VECTOR REGISTER

0

VR

(17h)

V7

V6

V5

V4

S

0*

0*

0*

V7-V4

S

*

Writing 0 : CLEARED

Writing 1 : SET

CLEARED on RESET

The upper four bits of the vector register are written by the user. These bits become the most

significant four bits of the interrupt vector number.

In-Service Register Enable. When the S bit is zero, the CMFP is in the automatic end-of-in-

terrupt mode and the In-Service register bits are forced low. When the S bit is a one, the

CMFP is in the software end-of-interrupt mode and the In-Service register bits are enabled.

Unused bits, read as zero.

Figure 8 : Daisy Chaining

TS68HC901

TS68HC901

TS68HC901

10/42

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