參數(shù)資料
型號: ATAM893T-TKSYD
廠商: Atmel
文件頁數(shù): 56/98頁
文件大小: 0K
描述: IC MCU FLASH 4K MTP 20SSOP
標準包裝: 830
系列: MARC4
核心處理器: MARC4
芯體尺寸: 4-位
速度: 4MHz
連通性: SSI(2 線,3 線)
外圍設(shè)備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 16
程序存儲器容量: 4KB(4K x 8)
程序存儲器類型: EEPROM
EEPROM 大小: 64 x 16
RAM 容量: 256 x 4
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 6.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 125°C
封裝/外殼: 20-SOIC(0.209",5.30mm 寬)
包裝: 管件
6
4680C–4BMCU–01/05
ATAM893-D
4.2.2.2
Return Stack
The 12-bit wide return stack is addressed by the Return stack Pointer (RP). It is used for storing
return addresses of subroutines, interrupt routines and for keeping loop index counts. The return
stack can also be used as a temporary storage area.
The MARC4 instruction set supports the exchange of data between the top elements of the
expression stack and the return stack. The two stacks within the RAM have a user definable
location and maximum depth.
Figure 4-3.
RAM Map
4.2.3
Registers
The MARC4 controller has seven programmable registers and one condition code register. They
are shown in the following programming model.
4.2.3.1
Program Counter (PC)
The program counter is a 12-bit register which contains the address of the next instruction to be
fetched 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.
RAM
FCh
00h
Autosleep
FFh
03h
04h
X
Y
SP
RP
TOS-1
Expression
stack
Return
stack
Global
variables
R
A
M
a
ddress
register:
07h
(256 x 4-bit)
Global
variables
4-bit
TOS
TOS-1
TOS-2
30
SP
Expression stack
Return stack
0
11
12-bit
RP
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