ST20C2 datasheet(12/212 Pages) STMICROELECTRONICS

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In addition, a number of constants are used to identify word length related values etc.;

These are listed in Table 1.5 .

A number of values are used by the ST20 to indicate the state of a process and other

conditions. These are listed in Table 1.6.

word offset

slot name

purpose

le.Index

contains the loop control variable

le.Count

contains number of iterations left to perform

Table 1.2 Loop end data structure

word offset

slot name

purpose

pp.Count

contains unsigned count of parallel processes

pp.IptrSucc

contains pointer to first instr uction of successor process

Table 1.3 Parallel process data structure

word offset

slot name

purpose

s.Back

back of waiting queue

s.Front

front of waiting queue

s.Count

number of extra processes that the semaphore will allow to continue

running on a

wait request

Table 1.4 Semaphore data structure

Name

Value

Meaning

BitsPerByte

8 The number of bits in a byte.

BitsPerWord

32 The number of bits in a word.

ByteSelectMask

#00000003

Used to select the byte select bits of an address.

WordSelectMask

#FFFFFFFC

Used to select the byte select bits of an address.

BytesPerWord

4 The number of bytes in a word.

MostNeg

#80000000

The most negative integer value.

MostPos

#7FFFFFFF The most positive signed integer value.

MostPosUnsigned

#FFFFFFFF

The most positive unsigned integer value.

PeripheralStart

#20000000

The lowest address reserved for memory-mapped on-

chip peripherals.

PeripheralEnd

#3FFFFFFF The highest address reserved for memory-mapped on-

chip peripherals.

Table 1.5 Constants used in the instruction descriptions

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