MAC7200 datasheet(906/976 Pages) FREESCALE

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Memory Map and Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

828

Freescale Semiconductor

34.6.1.14 TMS Pin Configuration Register

The TMS Pin Configuration Register (CONFIG_TMS) may be used to enable or disable certain

characteristics of the TMS pad.

Table 34-37. CONFIG_TDO Allowed Register Accesses

8-bit

16-bit

32-bit

READ

Allowed

Not Allowed

WRITE

Allowed

Not Allowed

Offset see Table 34-11

Access: see Table 34-39

987

6543210

0000

00000

DDR

PULL

Reset

0000

0000000

01100

Figure 34-16. Pin Configuration Register (CONFIG_TMS)

Table 34-38. CONFIG_TMS Field Descriptions

Field

Description

15–7

Reserved, should be cleared.

DDR

Data Direction Register. This bit switches the pin between output and input.

0 Pin is an input. The TDI functionality is enabled.

1 Pin is an output. The TDI functionality is disabled and the pad is driven low.

5–4

Reserved, should be cleared.

3–2

PULL

Pull-up/Pull-down Enable Register. These bits select a pull-up or pull-down device if enabled, and is only valid

when the pin is selected as an input. Note that the Pull-up functionality is enabled at reset.

00 No Pull-up/Pull-down

01 No Pull-up/Pull-down

10 Pull-down Enabled

11 Pull-up Enabled

1–0

Reserved, should be cleared.

Table 34-39. CONFIG_TMS Allowed Register Accesses

8-bit

16-bit

32-bit

READ

Allowed

(Reads CONFIG_TMS +

CONFIG_TCK)

WRITE

Allowed

(Writes CONFIG_TMS +

CONFIG_TCK)

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