參數(shù)資料
型號: UPD784054GC
廠商: NEC Corp.
英文描述: 16-BIT SINGLE-CHIP MICROCONTROLLER
中文描述: 16位單片機
文件頁數(shù): 21/86頁
文件大小: 579K
代理商: UPD784054GC
μ
PD784054(A)
21
6.2.2 Control registers
(1) Program counter (PC)
This is a 20-bit program counter. Its contents are automatically updated as the program is executed.
Figure 6-3. Program Counter (PC) Format
19
0
PC
(2) Program status word (PSW)
This register retains the status of the CPU and its contents are automatically updated as the program is
executed.
Figure 6-4. Program Status Word (PSW) Format
PSWH
UF
RBS2
RBS1
RBS0
15
14
13
12
11
9
10
8
PSW
PSWL
S
Z
RSS
Note
AC
IE
P/V
0
CY
7
6
5
4
3
1
2
0
Note
This flag is provided so that the
μ
PD784054(A) maintains compatibility with the 78K/III series. Be sure
to clear this flag to 0 when using 78K/III series software.
(3) Stack pointer (SP)
This is a 24-bit pointer that holds the first address of the stack.
Be sure to write 0 to the high-order 4 bits of this pointer.
Figure 6-5. Stack Pointer (SP) Format
SP
0
23
0
0
0
0
20
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