MAC7200 datasheet(907/976 Pages) FREESCALE

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Memory Map and Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

829

34.6.1.15 TCK Pin Configuration Register

The TCK Pin Configuration Register (CONFIG_TCK) may be used to enable or disable certain

characteristics of the TCK pad.

34.6.1.16 RESET Pin Configuration Register

The RESET Pin Configuration Register (CONFIG_RESET) may be used to enable a pull-down device on

the RESET pad. Since the RESET line is ACTIVE_LOW use this feature with caution. Also note that this

configuration can be written only once between two system resets and that the configuration is reset only

with a Power on Reset. So in order to securely disable this feature it is sufficient to write a 0x0000 to this

configuration register during startup.

Offset see Table 34-11

Access: see Table 34-41

987

6543210

0000

00000

DDR

PULL

Reset

0000

0000000

01000

Figure 34-17. Pin Configuration Register (CONFIG_TCK)

Table 34-40. CONFIG_TCK 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-down 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 34-41. CONFIG_TCK Allowed Register Accesses

8-bit

16-bit

32-bit

READ

Allowed

Not Allowed

WRITE

Allowed

Not Allowed

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