參數(shù)資料
型號： HD404828R
廠商： Hitachi,Ltd.
英文描述： AS Microcomputer Incorporating a LCD controller/Driver Circuit(帶LCD控制/驅(qū)動電路的微計(jì)算機(jī))
中文描述： 由于微機(jī)安裝有LCD控制器/驅(qū)動電路（帶液晶控制/驅(qū)動電路的微計(jì)算機(jī)）
文件頁數(shù)： 18/147頁
文件大?。?/td> 519K
代理商： HD404828R
HD404829R Series
18
SPX Register (SPX) and SPY Register (SPY)
The SPX and SPY registers are 4-bit registers used to supplement the X and Y registers.
Carry Flag (CA)
CA is a 1-bit flag that stores ALU overflow generated by an arithmetic operation. CA is set to 1 when an
overflow is generated, and is cleared to 0 after operations in which no overflow occurred. CA is also
affected by the carry set/carry clear instructions (SEC and REC), and by the rotate with carry instructions
(ROTL and ROTR.)
During interrupt handling, CA is saved on the stack, and is restored from the stack by the RTNI instruction.
Status Flag (ST)
ST is a 1-bit flag that stores the results of arithmetic instructions, compare instructions, and bit test
instructions, and is used as the branch condition for the BR, BRL, CAL, and CALL conditional branch
instructions.
The contents of the ST flag are held until the next arithmetic, compare, bit test, or conditional branch
instruction is executed. After the execution of a conditional branch instruction, the value of ST is set to 1
without regard to the condition.
During interrupt handling, ST is saved on the stack, and is restored from the stack by the RTNI instruction.
Program Counter (PC)
The PC is a 14-bit counter that indicates the ROM address of the next instruction the CPU will execute.
Stack Pointer (SP)
The SP is a 10-bit register that indicates the RAM address of the next stack frame in the stack area.
The SP is initialized to $3FF by a reset. The SP is decremented by 4 by a subroutine call or by interrupt
handling, and is incremented by 4 when the saved data has been restored by a return instruction.
The upper 4 bits of the SP are fixed at 1111; the maximum number of stack levels is thus 16.
In addition to the reset method described above, the SP can also be initialized to $3FF by clearing the reset
stack pointer (RSP) in the interrupt control bits area with a RAM bit manipulation instruction, i.e., REM or
REMD.
Reset
The MCU is reset by inputting a high-level voltage to the RESET pin. At power-on or when stop mode is
cancelled, RESET must be high for at least one t
R C
to enable the oscillator to stabilize. During operation,
RESET must be high for at least two instruction cycles.
Initial values after MCU reset are listed in table 1.
相關(guān)PDF資料
PDF描述
HD404829R AS Microcomputer Incorporating a LCD controller/Driver Circuit(帶LCD控制/驅(qū)動電路的微計(jì)算機(jī))
HD4048412 4-Bit Single-Chip Microcomputer
HD4048412FS 4-Bit Single-Chip Microcomputer
HD4048412H RELAY BASE
HD4048412TF 4-Bit Single-Chip Microcomputer
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD404828RFS 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:AS Microcomputer Incorporating a LCD controller/Driver Circuit
HD404828RH 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:AS Microcomputer Incorporating a LCD controller/Driver Circuit
HD404828RTF 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:AS Microcomputer Incorporating a LCD controller/Driver Circuit
HD404828TF 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller
HD404829FS 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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