r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 409

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

Bit
19
18 to 16 RDH
15
14 to 12 WTS
Bit Name
⎯
⎯
Initial
Value
0
111
0
111
R/W
R
R/W
R
R/W
Description
Reserved
This bit is always read as 0. The write value should
always be 0.
RD Hold Cycle (RD Negation–CSn Negation Delay
Cycle)
These bits specify the number of cycles to be inserted
as the time from RD negation to CSn negation. (Only
valid when the SRAM interface, byte control SRAM
interface, or burst ROM interface is selected.)
000: No cycle inserted (0 cycle delayed)
001: 1 cycle inserted (1 cycle delayed)
010: 2 cycles inserted (2 cycles delayed)
011: 3 cycles inserted (3 cycles delayed)
100: 4 cycles inserted (4 cycles delayed)
101: 5 cycles inserted (5 cycles delayed)
110: 6 cycles inserted (6 cycles delayed)
111: 7 cycles inserted (7 cycles delayed)
Reserved
This bit is always read as 0. The write value should
always be 0.
WE Setup Cycle (CSn Assertion–WE Assertion Delay
Cycle)
These bits specify the number of cycles to be inserted
as the time from CSn assertion to WE assertion. (Only
valid when the SRAM interface, byte control SRAM
interface, or burst ROM interface is selected.)
000: No cycle inserted (0.5 cycle delayed)
001: 1 cycle inserted (1.5 cycles delayed)
010: 2 cycles inserted (2.5 cycles delayed)
011: 3 cycles inserted (3.5 cycles delayed)
100: 4 cycles inserted (4.5 cycles delayed)
101: 5 cycles inserted (5.5 cycles delayed)
110: 6 cycles inserted (6.5 cycles delayed)
111: 7 cycles inserted (7.5 cycles delayed)
Rev.1.00 Jan. 10, 2008 Page 379 of 1658
11. Local Bus State Controller (LBSC)
REJ09B0261-0100