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參數(shù)資料
| 型號： | UPD78320L |
| 廠商： | NEC Corp. |
| 英文描述： | 16/8-BIT SINGLE-CHIP MICROCONTROLLER |
| 中文描述： | 16/8-BIT單片機 |
| 文件頁數(shù)： | 24/88頁 |
| 文件大?。?/td> | 479K |
| 代理商： | UPD78320L |
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24
μ
PD78320, 78322
The sixteen 8-bit registers can function as eight 16-bit register pairs (RP0 to RP7) as well.
As shown in Table 2-1, the sixteen 8-bit registers are characterized by functional names. The X register functions as
the lower half of the 16-bit accumulator, the A register functions as the upper half of the 8-bit or 16-bit accumulator, the B
and C registers function as counters, and DE, HL, VP and UP function as address register pairs. In particular the VP register
functions as a base register and the UP register functions as a user stack pointer.
The unique function register changes as shown in Table 2-1 according to the value of the register set select flag (RSS)
in the PSW.
Thus, if the program is described by the functional name, another register set of X, A, C and B can be used by means
of the RSS flag.
The
μ
PD78322 can carry out processed data addressing operations, implied addressing by functional names with
importance attached to the unique function of each register and register addressing by absolute names with a view to fast
processing with a small number of data transfers or creating highly descriptive programs.
Table 2-1. General Register Configuration
R5
A
R6
C
R7
B
R8
VP
L
VP
L
R9
VP
H
VP
H
R10
UP
L
UP
L
R11
UP
H
UP
H
R12
E
E
R13
D
D
R14
L
L
R15
H
H
Absolute
Name
Functional Name
RSS = 0
RSS = 1
R0
X
R1
A
R2
C
R3
B
R4
X
RP5
UP
UP
RP6
DE
DE
RP7
HL
HL
Absolute
Name
Functional Name
RSS = 0
RSS = 1
RP0
AX
RP1
BC
RP2
AX
RP3
BC
RP4
VP
VP
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