h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 406

• Manufacturer Part Number: h8s-2111b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Rev. 1.00, 05/04, page 372 of 544
Bit
4
3
Bit Name
FGA20E
SDWNE
Initial
Value Slave Host Description
0
0
R/W
R/W
R/W
—
—
Fast A20 Gate Function Enable
Enables or disables the fast A20 gate function. When
the fast A20 gate is disabled, the normal A20 gate can
be implemented by firmware operation of the P81
output.
When the fast A20 gate function is enabled, the DDR bit
for P81 must not be set to 1.
0: Fast A20 gate function disabled
•
•
1: Fast A20 gate function enabled
•
LPC Software Shutdown Enable
Controls host interface shutdown. For details of the LPC
shutdown function, and the scope of initialization by an
LPC reset and an LPC shutdown, see section 15.4.4,
Host Interface Shutdown Function (LPCPD).
0: Normal state, LPC software shutdown setting enabled
[Clearing conditions]
•
•
•
1: LPC hardware shutdown state setting enabled
•
[Setting condition]
•
Other function of pin P81 is enabled
GA20 output internal state is initialized to 1
GA20 pin output is open-drain (external VCC pull-up
resistor required)
Writing 0
LPC hardware reset or LPC software reset
LPC hardware shutdown release (rising edge of
LPCPD signal)
Hardware shutdown state when LPCPD signal is low
Writing 1 after reading SDWNE = 0