參數(shù)資料
型號： HD404458
廠商： Hitachi,Ltd.
英文描述： 4-bit HMCS400-Series microcomputer(4位單片微計(jì)算機(jī))
中文描述： 4位HMCS400系列微機(jī)（4位單片微計(jì)算機(jī)）
文件頁數(shù)： 7/120頁
文件大?。?/td> 692K
代理商： HD404458
HD404459 Series
7
RAM Memory Map
The HD404458 MCU contains a 512-digit
×
4-bit RAM area. The HD404459 and HD4074459 MCUs
contain 768-digit
×
4-bit RAM areas. Both of these RAM areas consist of a memory register area, a data
area, and a stack area. In addition, an interrupt control bits area, special register area, and register flag area
are mapped onto the same RAM memory space labeled as the RAM-mapped register area. See the RAM
memory map of figure 2.
RAM-Mapped Register Area ($000–$03F):
Interrupt control bits area ($000–$003)
This area is used for interrupt control bits (figure 3). These bits can be accessed only by RAM bit
manipulation instructions (SEM/SEMD, REM/REMD, and TM/TMD). However, note that not all the
instructions can be used for each bit. For limitations on using the instructions, refer to figure 4.
Special function register area ($004–$01F, $024–$03F)
This area is used as mode registers and data registers for external interrupts, serial interface,
timer/counters, and as data control registers for I/O ports. See figures 2 and 5. These registers can be
classified into three types: write-only (W), read-only (R), and read/write (R/W). RAM bit manipulation
instructions cannot be used for these registers.
Register flag area ($020–$023)
This area is used for the DTON, WDON, and other register flags and interrupt control bits (figure 3).
These bits can be accessed only by RAM bit manipulation instructions (SEM/SEMD, REM/REMD, and
TM/TMD). However, note that not all the instructions can be used for each bit. For limitations on using
the instructions, refer to figure 4.
Memory Register (MR) Area ($040–$04F):
Consisting of 16 addresses, this area (MR0–MR15) can be
accessed by register-register instructions (LAMR and XMRA). See figure 6.
Data Area ($050–$1FF for HD404458, $050–$2FF for HD404459/HD4074459)
Stack Area ($3C0–$3FF):
Used for saving the contents of the program counter (PC), status flag (ST), and
carry flag (CA) at subroutine call (CAL or CALL instruction) and for interrupts. This area can be used as a
16-level nesting subroutine stack in which one level requires four digits. See figure 6 for the data to be
saved and the save conditions.
The program counter is restored by either the RTN or RTNI instruction, but the status and carry flags can
only be restored by the RTNI instruction. Any unused space in this area can be used for data storage.
相關(guān)PDF資料
PDF描述
HD404459 4-bit HMCS400-Series microcomputer(4位單片微計(jì)算機(jī))
HD40A4052 4-Bit Single-Chip Microcomputer(4位單片微計(jì)算機(jī))
HD404092 4-Bit Single-Chip Microcomputer(4位單片微計(jì)算機(jī))
HD404094 4-Bit Single-Chip Microcomputer(4位單片微計(jì)算機(jī))
HD4074094 4-Bit Single-Chip Microcomputer(4位單片微計(jì)算機(jī))
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD404458H 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-bit HMCS400-series microcomputers
HD404459 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-bit HMCS400-series microcomputers
HD404459H 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-bit HMCS400-series microcomputers
HD404459SERIES 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
HD404508FS 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller
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