M32CSLASH8B datasheet(293/406 Pages) RENESAS

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M32C/8B Group

21. X/Y Conversion

Preliminary specification

Specifications in this manual are tentative and subject to change.

REJ09B0450-0050 Rev.0.50 Oct 31, 2008

Page 276 of 385

21. X/Y Conversion

Unimplemented.

Write 0. Read as undefined value.

Read mode set bit

X/Y Control Register

Symbol

XYC

Address

02E0h

Bit

Symbol

XYC0

After Reset

XXXX XX00b

XYC1

−

(b7-b2)

b7 b6 b5 b4

Bit Name

Function

0: Data converted

1: Data not converted

Write mode set bit

−

0: Bit alignment not converted

1: Bit alignment converted

The X/Y conversion rotates a 16 x 16 matrix data by 90 degrees and also inverts high-order bits and low-order bits of a

16-bit data. Figure 21.1 shows the XYC register.

The 16-bit XiR register (i = 0 to 15) and 16-bit YjR register (j = 0 to 15) are allocated to the same address. The XiR

even address in 16-bit units. Performance cannot be guaranteed if registers XiR and YjR are accessed in 8-bit units.

Figure 21.1

XYC Register

The XYC0 bit in the XYC register determines how to read the YjR register.

When setting the XYC0 bit to 0 (data converted) and reading the YjR register, all the bits j in registers X0R to X15R

can be read.

For example, bit 0 in the X0R register can be read when reading bit 0 in the Y0R register, bit 0 in the X1R register

when reading bit 1 in the Y0R register..., bit 0 in the X14R register when reading bit 14 in the Y0R register, and bit 0

in the X15R register when reading bit 15 in the Y0R register.

Figure 21.2 shows a conversion table when the XYC0 bit is set to 0. Figure 21.3 shows an example of the X/Y

conversion.

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