参数资料
型号: ATAM893T-TKQ
厂商: Atmel
文件页数: 67/98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)
7
4680C–4BMCU–01/05
ATAM893-D
Figure 4-4.
Programming Model
4.2.3.2
RAM Address Registers
The RAM is addressed with the four 8-bit wide RAM address registers: SP, RP, X and Y. These
registers allow access to any of the 256 RAM nibbles.
4.2.3.3
Expression Stack Pointer (SP)
The stack pointer contains the address of the next-to-top 4-bit item (TOS-1) of the expression
stack. The pointer is automatically pre-incremented if a nibble is moved onto the stack or post-
decremented if a nibble is removed from the stack. Every post-decrement operation moves the
item (TOS-1) to the TOS register before the SP is decremented. After a reset the stack pointer
has to be initialized with “>SP S0” to allocate the start address of the expression stack area.
4.2.3.4
Return Stack Pointer (RP)
The return stack pointer points to the top element of the 12-bit wide return stack. The pointer
automatically pre-increments if an element is moved onto the stack, or it post-decrements if an
element is removed from the stack. The return stack pointer increments and decrements in
steps of 4. This means that every time a 12-bit element is stacked, a 4-bit RAM location is left
unwritten. This location is used by the qFORTH compiler to allocate 4-bit variables. After a reset
the return stack pointer has to be initialized via “>RP FCh”.
4.2.3.5
RAM Address Registers (X and Y)
The X and Y registers are used to address any 4-bit item in the RAM. A fetch operation moves
the addressed nibble onto the TOS. A store operation moves the TOS to the addressed RAM
location. By using either the pre-increment or post-decrement addressing mode, arrays in the
RAM can be compared, filled or moved.
TOS
CCR
0
3
0
3
0
7
0
7
0
11
RP
SP
X
Y
PC
--
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
Carry/borrow
Branch
Interrupt enable
Reserved
0
7
C
0
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