HD64F38024DV Renesas Electronics America, HD64F38024DV Datasheet - Page 229

• Manufacturer Part Number: HD64F38024DV
• Description: IC H8/SLP MCU FLASH 80QFP
• Manufacturer: Renesas Electronics America
• Series: H8® H8/300L SLPr

Specifications of HD64F38024DV

• Core Processor: H8/300L
• Core Size: 8-Bit
• Speed: 10MHz
• Connectivity: SCI
• Peripherals: LCD, PWM, WDT
• Number Of I /o: 51
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

(7) Low-level interface routines
Table 9.3 List of Low-Level Interface Routines
Name
open
close
read
write
lseek
sbrk
error_addr*
wait_sem*
signal_sem*
Note: Necessary when using a reentrant library.
The function names open, close, read, write, lseek, and sbrk are reserved words for low-level
interface routine. They should not be used in user programs.
When using standard I/O or memory management library functions in a C/C++ program, low-
level interface routines must be created. Table 9.3 lists the low-level interface routines used by
C library functions.
Initialization necessary for low-level interface routines must be performed on program startup.
This initialization should be performed using the _INIT_LOWERLEVEL function described in
section 9.2.2 (5), C/C++ library function initial settings (_INITLIB).
Below, after explaining the basic approach to low-level I/O, the specifications for each
interface routine are described.
(a) Approach to I/O
In the standard I/O library, files are managed by means of FILE-type data; but in low-level
interface routines, positive integers are assigned to actual files in a one-to-one
correspondence for management. These integers are called file numbers.
In the open routine, a file number is provided for an input filename. The open routine must
set the following information such that this number can be used for file input and output.
The device type of the file (console, printer, disk file, etc.) (In the cases of special
devices such as consoles or printers, special filenames must be set by the system and
identified in the open routine.)
When using file buffering, information such as the buffer position and size
Description
Opens file
Closes file
Reads from files
Writes to files
Sets the read/write position in a file
Secures area in memory
Obtains errno address
Waits and acquires semaphore
Releases semaphore
Caution
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