Renesas H8S/2111B Manual do Utilizador descarregar pdf (Página 406)

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101

Rev. 1.00, 05/04, page 372 of 544

R/W

Bit Bit Name

Initial

Value

Slave Host Description

4 FGA20E 0 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

• Other function of pin P81 is enabled

• GA20 output internal state is initialized to 1

1: Fast A20 gate function enabled

• GA20 pin output is open-drain (external VCC pull-up

resistor required)

3 SDWNE 0 R/W — 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]

• Writing 0

• LPC hardware reset or LPC software reset

• LPC hardware shutdown release (rising edge of

LPCPD signal)

1: LPC hardware shutdown state setting enabled

• Hardware shutdown state when LPCPD signal is low

[Setting condition]

• Writing 1 after reading SDWNE = 0

1 2 ... 401 402 403 404 405 406 407 408 409 410 411 ... 581 582

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