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參數(shù)資料
| 型號： | UPD784020 |
| 廠商： | NEC Corp. |
| 英文描述： | 16/8-BIT SINGLE-CHIP MICROCOMPUTER |
| 中文描述： | 16/8-BIT單片機(jī) |
| 文件頁數(shù)： | 21/90頁 |
| 文件大小： | 614K |
| 代理商： | UPD784020 |
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21
m
PD784020, 784021
7.2 CPU REGISTERS
7.2.1 General-Purpose Registers
A set of general-purpose registers consists of sixteen general-purpose 8-bit registers. Two 8-bit general-purpose
registers can be combined to form a 16-bit general-purpose register. Moreover, four 16-bit general-purpose registers,
when combined with an 8-bit register for address extension, can be used as 24-bit address specification registers.
Eight banks of this register set are provided. The user can switch between banks by software or the context
switching function.
General-purpose registers other than the V, U, T, and W registers used for address extension are mapped onto
internal RAM.
Fig. 7-3 General-Purpose Register Format
Caution By setting the RSS bit of PSW to 1, R4, R5, R6, R7, RP2, and RP3 can be used as the X, A, C, B,
AX, and BC registers, respectively. However, this function must be used only when using
programs for the 78K/III series.
A (R1)
X (R0)
B (R3)
C (R2)
R5
R4
R7
R6
R9
R8
R11
R10
D (R13)
E (R12)
H (R15)
V
U
T
W
L (R14)
AX (RP0)
BC (RP1)
RP2
RP3
VP (RP4)
UP (RP5)
DE (RP6)
HL (RP7)
VVP (RG4)
UUP (RG5)
TDE (RG6)
WHL (RG7)
The character strings enclosed in
parentheses represent absolute names.
8 banks
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