32186 datasheet(802/1032 Pages) RENESAS

802 / 1032 page

NON-BREAK DEBUG (NBD)

16-4

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

16.2 Pin Functions of NBD

The following describes pin functions of NBD.

Table 16.2.1 NBD Pin Functions

Pin name

Type

Function

NBDD3–NBDD0

Input/output

Command and address/data input/output

NBDCLK

Input

Synchronous clock input

NBDSYNC#

Input

Top of data position recognition signal input

NBDEVNT#

Output

Event otuput (asserted "L" for 2BCLKs when an event occurs)

Note: • The NBD pins are shared with RTD, JTAG and other function. Before NBD can be used, the functions of the NBD

pins must be set using the NBD Pin Control Register (NBDCNT).

16.2.1 NBD Pin Control Register

NBD Pin Control Register (NBDCNT)

<Address: H'E000 0004>

123456

NBDSETP NBDSET

Bit Name

Function

0–5

No function assigned. Fix to "0."

NBDSETP

NBDSET write control bit

NBDSET

0: Set NBD-related pins for other than the NBD function

NBD-related pins select bit

1: Set NBD-related pins for the NBD function

Note: • The NBD function cannot be used while the system is reset (because NBDSET = 0). For the NBD function to be used, the

JTRST (JTAG reset) pin should be pulled "L."

The NBDSET bit selects the functions of the NBD-related pins. To use the NBD function, set this bit to "1," so

that the NBD-related pins will be set for the NBD pin functions shown in Table 16.2.1.

To set the register, follow the procedure described below.

1. Write a "1" to NBDSETP bit.

2. Subsequent to 1 above, write a "0" to NBDSETP bit and a "0" or "1" to NBDSET bit.

Notes: • If theare are writing cycles from CPU, DMA, SDI (tool), NBD to any other area between 1 and 2, the

continuous setting ( A pair of two consecutive is 1 set for writing operation) is disabled and the

writing value is not reflected. Therefore, disable interrupts and DMA transfers before setting.

However the writing cycle from RTD and DRI are not effected.

• In NBDCNT register, indefined value is outputted until EVTU_A register and EVTU_C register are set

after exiting reset, when set NBD related pin to NBD function.

16.2 Pin Functions of NBD

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