32186 datasheet(149/1032 Pages) RENESAS

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INTERNAL MEMORY

6-7

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

RAM Write Disable Protect Register (RAMWRPROT)

<Address: H'0080 053D>

Bit Name

Function

−13

No function assigned. Fix to "0."

RAMWRCNTP

RAMWRCNTPRO write control bit

RAMWRCNTPRO

0: Enable write to RAMWRCNTn

RAM write disable protect bit

1: Disable write to RAMWRCNTn

This register controls writes to the RAM Write Disable Control Register by enabling or disabling the write. If a

write to the RAM Write Disable Control Register (RAMWRCNT) is attempted when the RAMWRCNTPRO

bit = "1," the attempted write is ignored.

To set this register, follow the procedure described below.

1. Write a "1" to RAMWRCNTP.

2. Subsequent to 1 above, write a "0" to RAMWRCNTP and a set value ("0" or "1") to RAMWRCNTPRO.

Note: • If there 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.

6.3 Internal RAM Protect Function

11121314

b15

RAMWRCNTP RAMWRCNTPRO

000

00000

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