參數(shù)資料
型號(hào)： mPD784031
廠商： NEC Corp.
英文描述： 16/8-BIT SINGLE-CHIP MICROCONTROLLER
中文描述： 16/8-BIT單片機(jī)
文件頁(yè)數(shù)： 21/90頁(yè)
文件大?。?/td> 377K
代理商： MPD784031
μ
PD784031
21
7.2.2 Control registers
(1) Program counter (PC)
This register is a 20-bit program counter. The program counter is automatically updated by program execution.
Figure 7-3. Format of Program Counter (PC)
19
0
PC
(2) Program Status Word (PSW)
This register holds the CPU state. The program status word is automatically updated by program execution.
Figure 7-4. Format of Program Status Word (PSW)
PSWH
PSWL
PSW
15
14
13
12
UF
RBS2
RBS1
RBS0
11
10
9
8
7
6
5
4
3
2
1
0
S
Z
RSS
Note
AC
IE
P/V
0
CY
Note
This flag is used to maintain compatibility with the 78K/III series. This flag must be set to 0 when programs
for the 78K/III series are being used.
(3) Stack pointer (SP)
This register is a 24-bit pointer for holding the start address of the stack. The high-order 4 bits must be set
to 0.
Figure 7-5. Format of Stack Pointer (SP)
23
20
0
PC
0
0
0
0
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