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參數(shù)資料
| 型號(hào)： | M44C090-H |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Low-Current Microcontroller for Wireless Communication |
| 中文描述： | 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20 |
| 封裝： | SSO-20 |
| 文件頁(yè)數(shù)： | 7/63頁(yè) |
| 文件大小： | 503K |
| 代理商： | M44C090-H |
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M44C890
M44C090
Rev.A4, 14-Dec-01
7 (63)
TOS
–
2
RAM
(192 x 4-bit)
FCh
00h
FFh
03h
04h
X
Y
SP
RP
Expression
stack
Return
stack
Global
variables
R
07h
Global
variables
4-bit
SP
Expression stack
Return stack
12-bit
RP
13392
Figure 5. RAM map
2.2.3
Registers
The MARC4 controller has seven programmable
registers and one condition code register. They are shown
in the following programming model.
Program Counter (PC)
The program counter (PC) is a 12-bit register which
contains the address of the next instruction to be fetched
11
PC
from the ROM. Instructions currently being executed are
decoded in the instruction decoder to determine the
internal micro-operations. For linear code (no calls or
branches) the program counter is incremented with every
instruction cycle. If a branch-, call-, return-instruction or
an interrupt is executed, the program counter is loaded
with a new address. The program counter is also used with
the TABLE instruction to fetch 8-bit wide ROM
constants.
TOS
CCR
0
3
0
3
0
7
0
7
0
0
7
0
RP
SP
X
Y
––
B
I
Program counter
Return stack pointer
Expression stack pointer
RAM address register (X)
RAM address register (Y)
Top of stack register
Condition code register
Interrupt enable
Carry / borrow
Branch
Reserved
0
7
C
0
0
Figure 6. Programming model
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