ST18-AU1 datasheet(49/87 Pages) STMICROELECTRONICS

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ST18-AU1

XER0/1: X-memory space control registers

After reset, XER0/1 default values are 0x83EF/0x83FF

YER0/1: Y-memory space control registers

After reset, YER0/1 default values are 0x83EF/0x83FF

IER0/1: Instruction memory control registers

After reset, IER0/1 default values are 0x83EF/0x83FF or 0xC3EF/0xC3FF (the EN_I value

depends on the IDT_EN input value).

9876

EN_X

XA15 XA14 XA13 XA12 XA11 XA10

Bit

Function

W3:0

Wait state count (1 to 16) for off-chip access (X-memory space)

XA15:10

X-memory space map for boundary on-chip or off-chip

EN_X

Enable for X-space data exchanges

Intel/Motorola

0: Motorola type for memories

1: Intel type for memories (default)

RESERVED. R

ead 0, write don’t care.

EN_Y

YA15 YA14 YA13 YA12 YA11 YA10

Bit

Function

W3:0

Wait state count (1 to 16) for off-chip access (Y-memory space)

YA15:10

Y-memory space map for boundary on-chip or off-chip

EN_Y

Enable for Y-space data exchanges

Intel/Motorola

0: Motorola type for memories

1: Intel type for memories (default)

RESERVED. R

ead 0, write don’t care.

9876543210

EN_I

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IA15 IA14 IA13 IA12 IA11 IA10

ST18-AU1 Datasheet(PDF) 49 Page - STMicroelectronics

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