参数资料
型号: ATAM893T-TKQ
厂商: Atmel
文件页数: 56/98页
文件大小: 0K
描述: IC MON TIRE-PRESS ATARX9X SER
标准包装: 4,000
系列: MARC4
核心处理器: MARC4
芯体尺寸: 4-位
速度: 4MHz
连通性: SSI(2 线,3 线)
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 16
程序存储器容量: 4KB(4K x 8)
程序存储器类型: EEPROM
EEPROM 大小: 64 x 16
RAM 容量: 256 x 4
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 6.5 V
振荡器型: 内部
工作温度: -40°C ~ 125°C
封装/外壳: 20-SOIC(0.209",5.30mm 宽)
包装: 带卷 (TR)
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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