H8S2110B RENESAS [Renesas Technology Corp], H8S2110B Datasheet - Page 85
H8S2110B
Manufacturer Part Number
H8S2110B
Description
Renesas 16-Bit Single-Chip Microcomputer Renesas H8S Family/H8S/2100 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.H8S2110B.pdf
(559 pages)
- Current page: 85 of 559
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Prior to executing BCLR:
BCLR instruction executed:
After executing BCLR:
Operation:
1. When the BCLR instruction is executed, first the CPU reads P4DDR.
2. The CPU clears bit 0 of the read data to 0, changing data to H'FE.
3. The CPU writes H'FE to DDR, completing execution of BCLR.
As a result of the BCLR instruction, bit 0 in DDR is set to 0, and P40 becomes an input pin.
However, bits 7 and 6 of DDR are modified to 1, therefore P47 and P46 become output pins.
Input/output
Pin state
DDR
DR
BCLR #0,
Input/output
Pin state
DDR
DR
Since P4DDR is a write-only register, so the CPU reads H'FF. In this example P4DDR has a
value of H'3F, but the value read by the CPU is H'FF.
@P4DDR
P47
Input
Low
level
0
1
P47
Output
Low
level
1
1
P46
Input
High
level
0
0
P46
Output
High
level
1
0
The BCLR instruction is executed for DDR in port 4.
P45
Output
Low
level
1
0
P45
Output
Low
level
1
0
P44
Output
Low
level
1
0
P44
Output
Low
level
1
0
P43
Output
Low
level
1
0
P43
Output
Low
level
1
0
Rev. 2.00 Mar 21, 2006 page 47 of 518
P42
Output
Low
level
1
0
P42
Output
Low
level
1
0
P41
Output
Low
level
1
0
P41
Output
Low
level
1
0
REJ09B0299-0200
Section 2 CPU
P40
Output
Low
level
1
0
P40
Input
High
level
0
0
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