參數(shù)資料
型號(hào)： UPD784915B
廠商： NEC Corp.
英文描述： 16-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 16位單晶片微控制器
文件頁(yè)數(shù)： 20/86頁(yè)
文件大?。?/td> 384K
代理商： UPD784915B
μ
PD784915B, 784916B
20
3.1.2 Other CPU registers
(1) Program counter
The program counter of the
μ
PD784916B is 20 bits wide. The value of the program counter is automatically
updated as the program is executed.
(2) Program status word
This is a register that holds the various statuses of the CPU. Its contents are automatically updated as the program
is executed.
Note
The RSS flag is provided to maintain compatibility with the microcontrollers in the 78K/III Series. Always
set this flag to 0 except when the software of the 78K/III Series is used.
(3) Stack pointer
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.
3.2 Memory Space
The
μ
PD784916B can access a 64 Kbyte memory space.
Table 3-1 shows the addresses of the internal ROM and internal data areas.
Table 3-1. Memory Space
Part Number
Internal ROM Area
Internal Data Area
μ
PD784915B
0000H-BFFFH
FA00H-FFFFH
μ
PD784916B
0000H-F7FFH
Caution
Some products in the 78K/IV Series can access up to 1 Mbyte of memory space in an address
expansion mode which is set by the LOCATION instruction. However, the memory space of the
μ
PD784916B is 64 Kbytes (0000H to FFFFH). Therefore, be sure to execute the LOCATION 0
instruction immediately after reset to set the memory space to 64 Kbytes (the LOCATION
instruction cannot be used more than twice).
19
0
PC
PSWH
UF
15
RBS2
14
RBS1
13
RBS0
12
11
10
9
8
PSWL
S
7
Z
6
RSS
5
AC
4
IE
3
P/V
2
0
1
CY
0
PSW
23
0
0
0
0
20
0
SP
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