DF3048BVX25V Renesas Electronics America, DF3048BVX25V Datasheet - Page 81

• Manufacturer Part Number: DF3048BVX25V
• Description: MCU 3/5V 128K PB-FREE 100-TQFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300Hr

Specifications of DF3048BVX25V

• Core Processor: H8/300H
• Core Size: 16-Bit
• Speed: 25MHz
• Connectivity: SCI, SmartCard
• Peripherals: DMA, PWM, WDT
• Number Of I /o: 70
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 100-TQFP, 100-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

2.6.5
The BSET, BCLR, BNOT, BST, and BIST instructions read a byte of data, modify a bit in the
byte, then write the byte back. Care is required when these instructions are used to access registers
with write-only bits, or to access ports.
The BCLR instruction can be used to clear flags in the internal I/O registers. In an interrupt-
handling routine, for example, if it is known that the flag is set to 1, it is not necessary to read the
flag ahead of time.
Step
1
2
3
In the following example, a BCLR instruction is executed on the data direction register (DDR) of
port 4.
P4
P4
In this example, the BCLR instruction is used to make P4
Before Execution of BCLR Instruction
Input/output
DDR
DR
Execution of BCLR Instruction
BCLR
7
5
and P4
to P4
Read
Bit manipulation
Write
#0, @P4DDR
0
Notes on Use of Bit Manipulation Instructions
are set as output pins, and are in the low-level output state.
6
are set as input pins, and are inputting low-level and high-level signals, respectively.
P4
Input
0
1
7
P4
Input
0
0
; Execute BCLR instruction on DDR
6
Description
Read data (byte unit) at the specified address
Modify the specified bit in the read data
Write the modified data (byte unit) to the specified address
P4
Output
1
0
5
P4
Output
1
0
4
0
Rev. 3.00 Sep 27, 2006 page 53 of 872
an input port.
P4
Output
1
0
3
P4
Output
1
0
2
P4
Output
1
0
REJ09B0325-0300
1
Section 2 CPU
P4
Output
1
0
0