DF2506BR26DV Renesas Electronics America, DF2506BR26DV Datasheet - Page 110

• Manufacturer Part Number: DF2506BR26DV
• Description: IC H8S/2506 MCU FLASH 176-LFBGA
• Manufacturer: Renesas Electronics America
• Series: H8® H8S/2500r

Specifications of DF2506BR26DV

• Core Processor: H8S/2000
• Core Size: 16-Bit
• Speed: 26MHz
• Connectivity: I²C, SCI
• Peripherals: POR, PWM, WDT
• Number Of I /o: 104
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 16x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 176-LFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Section 2 CPU
The BSET, BCLR, BNOT, BST and BIST instructions are executed as follows:
1. Data is read in bytes.
2. The operation corresponding to the instruction is applied to the specified bit of the data.
3. The byte produced by the bit-manipulation is written back.
• Consider this example, where the BCLR instruction is executed to clear only bit 4 in P1DDR
Rev. 6.00 Sep. 24, 2009 Page 62 of 928
REJ09B0099-0600
I/O
P1DDR
I/O
P1DDR
Read value
of Port 1.
P1DDR is an 8-bit register that consists of write-only bits and specifies input or output for
each pin of port 1. Reading of these bits is not valid, since values read are specified as
undefined.
In the following example, the BCLR instruction specifies P14 as an input. Before the
operation, P17 to P14 are set as output pins and P13 to P10 are set as input pins. The value of
P1DDR is H'F0.
To switch P14 from an output to an input, the value of bit 4 in P1DDR has to be changed from
1 to 0 (from H'F0 to H'E0). The BCLR instruction used to clear bit 4 in P1DDR is as follows.
BCLR
However, the above bit-manipulation of the write-only P1DDR register may cause the
following problem.
The data in P1DDR is read in bytes. Data read from P1DDR is undefined. Thus, regardless of
whether the value in the register is 0 or 1, it is impossible to tell which value will be read. All
bits in P1DDR are write-only, thus read as undefined. The actual value in P1DDR is H'F0. Let
us assume that the value read is H'F8, where the value of bit 3 is read as 1 rather than its actual
value of 0.
Output
Output
#4, @P1DDR
P17
P17
1
1
1
Output
Output
P16
P16
1
1
1
Output
Output
P15
P15
1
1
1
Output
Output
P14
P14
1
1
1
Input
Input
P13
P13
0
0
1
Input
Input
P12
P12
0
0
0
Input
Input
P11
P11
0
0
0
Input
Input
P10
P10
0
0
0