MC9S08SH8CSC 查看數據表（PDF） - Freescale Semiconductor

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MC9S08SH8CSC

HCS08 Microcontrollers

Freescale Semiconductor 

Chapter 6 Parallel Input/Output Control

6.6.1.8 Port A Interrupt Edge Select Register (PTAES)

7

R

0

W

Reset:

0

6

5

4

3

2

0

0

0

PTAES3

PTAES2

0

0

0

0

0

Figure 6-10. Port A Edge Select Register (PTAES)

Table 6-9. PTAES Register Field Descriptions

1

PTAES1

0

0

PTAES0

0

Field

Description

3:0

PTAES[3:0]

Port A Edge Selects — Each of the PTAESn bits serves a dual purpose by selecting the polarity of the active

interrupt edge as well as selecting a pull-up or pull-down device if enabled.

0 A pull-up device is connected to the associated pin and detects falling edge/low level for interrupt generation.

1 A pull-down device is connected to the associated pin and detects rising edge/high level for interrupt

generation.

MC9S08SH8 MCU Series Data Sheet, Rev. 3

84

Freescale Semiconductor

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