參數(shù)資料
型號(hào)： M38049FFHHP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 8.4 MHz, MICROCONTROLLER, PQFP64
封裝： 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù)： 108/118頁
文件大小： 1202K
代理商： M38049FFHHP
Rev.1.01
Jan 25, 2005
page 7 of 114
REJ03B0131-0101Z
3804 Group (Spec. H)
FUNCTIONAL DESCRIPTION
CENTRAL PROCESSING UNIT (CPU)
The 3804 group (Spec. H) uses the standard 740 Family instruc-
tion set. Refer to the table of 740 Family addressing modes and
machine instructions or the 740 Family Software Manual for de-
tails on the instruction set.
Machine-resident 740 Family instructions are as follows:
The FST and SLW instructions cannot be used.
The STP, WIT, MUL, and DIV instructions can be used.
[Accumulator (A)]
The accumulator is an 8-bit register. Data operations such as data
transfer, etc. are executed mainly through the accumulator.
[Index Register X (X)]
The index register X is an 8-bit register. In the index addressing
modes, the value of the OPERAND is added to the contents of
register X and specifies the real address.
[Index Register Y (Y)]
The index register Y is an 8-bit register. In partial instruction, the
value of the OPERAND is added to the contents of register Y and
specifies the real address.
Fig. 6 740 Family CPU register structure
[Stack Pointer (S)]
The stack pointer is an 8-bit register used during subroutine calls
and interrupts. This register indicates start address of stored area
(stack) for storing registers during subroutine calls and interrupts.
The low-order 8 bits of the stack address are determined by the
contents of the stack pointer. The high-order 8 bits of the stack ad-
dress are determined by the stack page selection bit. If the stack
page selection bit is “0” , the high-order 8 bits becomes “0016”. If
the stack page selection bit is “1”, the high-order 8 bits becomes
“ 01
16
” .
The operations of pushing register contents onto the stack and
popping them from the stack are shown in Figure 7.
Store registers other than those described in Figure 6 with pro-
gram when the user needs them during interrupts or subroutine
calls (see Table 3).
[Program Counter (PC)]
The program counter is a 16-bit counter consisting of two 8-bit
registers PCH and PCL. It is used to indicate the address of the
next instruction to be executed.
A
Accumulator
b7
b0
b7
b15
b0
b7
b0
X
Index register X
Y
Index register Y
S
Stack pointer
PCL
Program counter
PCH
N V T B D I Z C
Processor status register (PS)
Carry flag
Zero flag
Interrupt disable flag
Decimal mode flag
Break flag
Index X mode flag
Overflow flag
Negative flag
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