h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 416
h8s-2111b
Manufacturer Part Number
h8s-2111b
Description
Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2111B.pdf
(582 pages)
- Current page: 416 of 582
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• STR1
Note:
Rev. 1.00, 05/04, page 382 of 544
Bits 15 to 4
0000 0000 0110
0000 0000 0110
Bit
7
6
5
4
3
2
1
0
*
Bit Name
DBU17
DBU16
DBU15
DBU14
C/D1
DBU12
IBF1
OBF1
Only 0 can be written to clear the flag.
Initial
Value Slave Host Description
0
0
0
0
0
0
0
0
I/O Address
Bit 3
0
0
R/W
R/W
R/W
R/W
R
R/W
R
R/(W)* R
Bit 2
1
1
R/W
R
R
R
R
R
R
R
Bit 1
0
1
Defined by User
The user can use these bits as necessary.
Command/Data
When the host processor writes to an IDR register, bit 2
of the I/O address is written into this bit to indicate
whether IDR contains data or a command.
0: Contents of data register (IDR) are data
1: Contents of data register (IDR) are a command
Defined by User
The user can use this bit as necessary.
Input Buffer Full
Set to 1 when the host processor writes to IDR. This bit
is an internal interrupt source to the slave processor
(this LSI). IBF is cleared to 0 when the slave processor
reads IDR.
The IBF1 flag setting and clearing conditions are
different when the fast A20 gate is used. For details see
table 15.3.
0: [Clearing condition]
1: [Setting condition]
Output Buffer Full
Set to 1 when the slave processor (this LSI) writes to
ODR. Cleared to 0 when the host processor reads
ODR.
0: [Clearing condition]
1: [Setting condition]
When the slave processor reads IDR
When the host processor writes to IDR using I/O
write cycle
When the slave processor writes to ODR
When the host processor reads ODR using I/O read
cycle, or the slave processor writes 0 to the OBF bit
Bit 0
0
0
Transfer
Cycle
I/O read
I/O read
Host Register Selection
STR1 read
STR2 read
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