參數(shù)資料
型號: UPD784907
廠商: NEC Corp.
英文描述: 16-BIT SINGLE-CHIP MICROCONTROLLER
中文描述: 16位單片機(jī)
文件頁數(shù): 26/98頁
文件大?。?/td> 657K
代理商: UPD784907
μ
PD784907, 784908
26
Data Sheet U11680EJ2V0DS00
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 7-4. Format of Program Counter (PC)
19
0
PC
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
23
20
0
SP
0
0
0
0
(2) Program Status Word (PSW)
This register holds the CPU state. The program status word is automatically updated by program execution.
Figure 7-5. Format of Program Status Word (PSW)
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 not being used.
(3) Stack pointer (SP)
This register is a 24-bit pointer for holding the start address of the stack.
The higher 4 bits must be set to 0.
Figure 7-6. Format of Stack Pointer (SP)
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