HCS08 datasheet(86/316 Pages) NXP

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Chapter 6 Parallel Input/Output Control

MC9S08SG8 MCU Series Data Sheet, Rev. 8

Freescale Semiconductor

6.6.2.5

Port B Drive Strength Selection Register (PTBDS)

6.6.2.6

Port B Interrupt Status and Control Register (PTBSC)

321

PTBDS7

PTBDS6

PTBDS5

PTBDS4

PTBDS3

PTBDS2

PTBDS1

PTBDS0

Reset:

000

Figure 6-15. Drive Strength Selection for Port B Register (PTBDS)

Table 6-14. PTBDS Register Field Descriptions

Field

Description

7:0

PTBDS[7:0]

Output Drive Strength Selection for Port B Bits — Each of these control bits selects between low and high

output drive for the associated PTB pin. For port B pins that are configured as inputs, these bits have no effect.

0 Low output drive strength selected for port B bit n.

1 High output drive strength selected for port B bit n.

321

000

PTBIF

PTBIE

PTBMOD

PTBACK

Reset:

000

Figure 6-16. Port B Interrupt Status and Control Register (PTBSC)

Table 6-15. PTBSC Register Field Descriptions

Field

Description

PTBIF

Port B Interrupt Flag — PTBIF indicates when a Port B interrupt is detected. Writes have no effect on PTBIF.

0 No Port B interrupt detected.

1 Port B interrupt detected.

PTBACK

Port B Interrupt Acknowledge — Writing a 1 to PTBACK is part of the flag clearing mechanism. PTBACK

always reads as 0.

PTBIE

Port B Interrupt Enable — PTBIE determines whether a port B interrupt is requested.

0 Port B interrupt request not enabled.

1 Port B interrupt request enabled.

PTBMOD

Port B Detection Mode — PTBMOD (along with the PTBES bits) controls the detection mode of the port B

interrupt pins.

0 Port B pins detect edges only.

1 Port B pins detect both edges and levels.

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