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TMS370C3C0ANA Datasheet(PDF) 6 Page - Texas Instruments

Part # TMS370C3C0ANA
Description  8-BIT MICROCONTROLLER
Download  64 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TMS370C3C0ANA Datasheet(HTML) 6 Page - Texas Instruments

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TMS370CxCx
8-BIT MICROCONTROLLER
SPNS040B – NOVEMBER 1995 – REVISED FEBRUARY 1997
6
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
central processing unit (CPU) (continued)
Figure 1 illustrates the CPU registers and memory blocks.
0080h
0FFFh
Reserved†
Peripheral File
Not Available‡
1FFFh
2000h
5FFFh
6000h
Interrupts and Reset Vectors;
Trap Vectors
107Fh
1080h
Reserved
7FFFh
0
RAM (Includes up to 256-Byte Registers File)
0
15
Program Counter
7
Legend:
Z=Zero
IE1=Level 1 interrupts Enable
C=Carry
V=Overflow
N=Negative
IE2=Level 2 interrupts Enable
IE1
IE2
Z
N
C
0
1
2
3
4
5
6
7
V
Status Register (ST)
Stack Pointer (SP)
R0(A)
R1(B)
R3
0000h
0001h
0002h
R127
0003h
R2
007Fh
6FFFh
7000h
8K-Byte EPROM (6000h – 7FFFh)
4K-Byte ROM (7000h – 7FFFh)
7FC0h
7FBFh
128-Byte RAM (0000h–007Fh)
007Fh
1000h
0000h
† Reserved means the address space is reserved for future expansion.
‡ Not available means the address space is not accessible.
Figure 1. Programmer’s Model
A memory map that includes:
D 128-byte general-purpose RAM that can be used for data memory storage, program instructions,
general-purpose register, or the stack
D A peripheral file that provides access to all internal peripheral modules, system-wide control functions and
EPROM programming control
D 4K-byte ROM or 8K-byte EPROM program memory
stack pointer (SP)
The SP is an 8-bit CPU register that operates as a last-in, first-out, read / write memory. Typically, the stack is
used to store the return address on subroutine calls as well as the status-register contents during interrupt
sequences.
The SP points to the last entry or top of the stack. The SP is incremented automatically before data is pushed
onto the stack and decremented after data is popped from the stack. The stack can be placed anywhere in the
on-chip RAM.


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