h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 617

• Manufacturer Part Number: h8s-2169
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

HICR Bit 0—Fast A20 Gate Function Enable (FGA20E): Enables or disables the fast A20 gate
function. When the fast A20 gate is disabled, the normal A20 gate can be implemented byte
firmware operation of the P81 output.
When the host interface (HIF:XBS) fast A20 gate function is enabled, the DDR bit for P81 must
be set to 1. Therefore, the state of the P81/GA20 pin cannot be monitored by reading the DR bit
for P81.
A fast A20 gate function is also provided in the HIF:LPC. The state of the P81/GA20 pin can be
monitored by reading the HIF:LPC’s GA20 bit.
HICR2
Bit 2
IBFIE4
—
—
—
—
—
—
0
1
HICR
Bit 0
FGA20E
0
1
HICR2
Bit 1
IBFIE3
—
—
—
—
0
1
—
—
P8DDR
Bit 1
P81DDR
0
1
0
1
HICR
Bit 2
IBFIE2
—
—
0
1
—
—
—
—
Description
HIF:XBS fast A20 gate function disabled
HIF:XBS fast A20 gate function disabled
Setting prohibited
HIF:XBS fast A20 gate function enabled
HICR
Bit 1
IBFIE1
0
1
—
—
—
—
—
—
Description
Input data register (IDR1) reception completed interrupt
request disabled
Input data register (IDR1) reception completed interrupt
request enabled
Input data register (IDR2) reception completed interrupt
request disabled
Input data register (IDR2) reception completed interrupt
request enabled
Input data register (IDR3) reception completed interrupt
request disabled
Input data register (IDR3) reception completed interrupt
request enabled
Input data register (IDR4) reception completed interrupt
request disabled
Input data register (IDR4) reception completed interrupt
request enabled
Section 18A Host Interface X-Bus Interface (XBS)
Rev. 3.00 Jan 18, 2006 page 589 of 1044
REJ09B0280-0300
(Initial value)
(Initial value)
(Initial value)
(Initial value)
(Initial value)