HD64F2218UTF24 Renesas Electronics America, HD64F2218UTF24 Datasheet - Page 124
HD64F2218UTF24
Manufacturer Part Number
HD64F2218UTF24
Description
IC H8S MCU FLASH 128K 100-TQFP
Manufacturer
Renesas Electronics America
Series
H8® H8S/2200r
Specifications of HD64F2218UTF24
Core Processor
H8S/2000
Core Size
16-Bit
Speed
24MHz
Connectivity
SCI, SmartCard, USB
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
69
Program Memory Size
128KB (128K x 8)
Program Memory Type
FLASH
Ram Size
12K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 6x10b
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
100-TQFP, 100-VQFP
For Use With
3DK2218-SS - KIT DEV H8S/2218 WINDOWS SIDESHW
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
HD64F2218UTF24V
Manufacturer:
RENESAS/瑞萨
Quantity:
20 000
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I/O
P1DDR
Read value
The BCLR instruction performs bit manipulation on the read value, which is H'F8 in this example.
It clears bit 4 to 0.
I/O
P1DDR
After bit
manipulation
Following bit manipulation the data is written to P1DDR and the BCLR instruction terminates.
I/O
P1DDR
Write value
The contents of P1DDR should have been overwritten with a value of H'E0, but in fact a value of
H'E8 was written to the register. This changed pin 13, which should have been an input pin, to an
output pin. In this example we assumed that the value of bit 1 in P1DDR was 1. However, since
the values of bits 7 to 0 in P1DDR are all undefined when read, there is the possibility that
individual bit values could be changed from 0 to 1 or from 1 to 0. To prevent this from happening,
the recommendations in section 2.9.4, Accessing Registers Containing Write-Only Bits, should be
followed when changing the values of registers containing write-only bits.
In addition, the BCLR instruction can be used to clear flags in internal I/O registers to 0. In such
cases it is not necessary to read the relevant flag beforehand so long as it is clear that it has been
set to 1 by an interrupt processing routine or the like.
2.9.4
Using data transfer instructions or bit manipulation instructions on registers containing write-only
bits can result in undefined values being read. To prevent the reading of undefined values, the
procedure described below should be used to access registers containing write-only bits.
Rev.7.00 Dec. 24, 2008 Page 68 of 698
REJ09B0074-0700
Accessing Registers Containing Write-Only Bits
P17
Output
1
1
P17
Output
1
1
P17
Output
1
1
P16
Output
1
1
P16
Output
1
1
P16
Output
1
1
P15
Output
1
1
P15
Output
1
1
P15
Output
1
1
P14
Output
1
1
P14
Output
1
0
P14
Input
0
0
P13
Input
0
1
P13
Input
0
1
P13
Output
1
1
P12
Input
0
0
P12
Input
0
0
P12
Input
0
0
P11
Input
0
0
P11
Input
0
0
P11
Input
0
0
P10
Input
0
0
P10
Input
0
0
P10
Input
0
0
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