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TMS370 Datasheet(PDF) 11 Page - Texas Instruments

Part # TMS370
Description  8-BIT MICROCONTROLLER
PDF  43 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TMS370 Datasheet(HTML) 11 Page - Texas Instruments

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TMS370Cx32
8-BIT MICROCONTROLLER
SPNS015C – FEBRUARY 1990 – REVISED FEBRUARY 1997
11
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
system reset (continued)
Table 6. Reset Sources
REGISTER
ADDRESS
PF
BIT NO.
CONTROL BIT
SOURCE OF RESET
SCCR0
1010h
P010
7
COLD START
Cold (power-up)
SCCR0
1010h
P010
4
OSC FLT FLAG
Oscillator out of range
Once a reset is activated, the following sequence of events occurs:
1.
The CPU registers are initialized: ST = 00h, SP = 01h (reset state).
2.
Registers A and B are initialized to 00h (no other RAM is changed).
3.
The contents of the LSbyte of the reset vector (07FFh) are read and stored in the PCL.
4.
The contents of the MSbyte of the reset vector (07FEh) are read and stored in the PCH.
5.
Program execution begins with an opcode fetch from the address pointed to the PC.
The reset sequence takes 20 SYSCLK cycles from the time the reset pulse is released until the first opcode
fetch. During a reset, RAM contents (except for registers A and B) remain unchanged, and the module control
register bits are initialized to their reset state.



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