M32C80 Datasheet, PDF (260/352 Pages) Renesas Technology Corp – 16/32-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M32C/80 SERIES

M32C/80 Group
20. X/Y Conversion
20. X/Y Conversion
The X/Y conversion rotates a 16 x 16 matrix data by 90 degrees and inverses high-order bits and low-order
bits of a 16-bit data. Figure 20.1 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 register is a write-only register, while the YjR register is a read-only register. Access the XiR and YjR
registers from an even address in 16-bit units. Performance cannot be guaranteed if the XiR and YiR
registers are accessed in 8-bit units.
X/Y Control Register
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
XYC
Address
02E016
After Reset
XXXX XX002
Bit
Symbol
Bit Name
Function
RW
XYC0 Read Mode Set Bit
0: Data is converted
RW
1: No data is converted
XYC1 Write Mode Set Bit
0: Bit alignment is not converted
1: Bit alignment is converted
RW
Noting is assigned. When write, set to "0".
(b7 - b2) When read, its content is indeterminate.
Figure 20.1 XYC Register
Rev. 1.00 Nov. 01, 2005 ^{Page 241} of 330
REJ09B0271-0100