TSC80251 TEMIC [TEMIC Semiconductors], TSC80251 Datasheet - Page 219

• Manufacturer Part Number: TSC80251
• Manufacturer: TEMIC [TEMIC Semiconductors]

Rev. C – May 7, 1999
multiplexed bus
OTPROM
PC
program memory
RAM
rel
reserved bits
ROM
set
SFR
sign extension
source–code compatibility
source mode
SP
SPX
state time (or state)
word
A bus on which the data is time–multiplexed with (some of) the address bits.
One–time–programmable read–only memory, a version of EPROM.
Program counter.
A part of memory where instructions can be stored for fetching and execution.
Random access memory
A signed (two’s complement) 8–bit, relative destination address. The destination
is –128 to +127 bytes relative to the first byte of the next instruction.
Register bits that are not used in this device but may be used in future
implementations. Avoid any software dependence on these bits. In most cases: the
value read from this bit is indeterminate; do not set this bit.
Read only memory
The term set refers to the value of a bit or the act of giving it a value. If a bit is set,
its value is “1”; setting a bit gives it a “1” value.
Special Function Register.
A method for converting data to a larger format by filling the extra bit positions with
the value of the sign. This conversion preserves the positive or negative value of
signed integers.
The ability of an TSC80251 microcontroller to execute recompiled source code
written for an 80C51 microcontroller.
An operating mode that is selected by a configuration bit. In source mode, a
TSC80251 microcontroller can execute recompiled source code written for a
80C51 microcontroller. In source mode, the TSC80251 microcontroller cannot
execute unmodified binary code written for an 80C51 microcontroller. See binary
mode.
Stack pointer.
Extended stack pointer.
The basic time unit of the microcontroller; the combined period of the two internal
timing signals, PH1 and PH2. (The internal clock generator produces PH1 and PH2
by halving the frequency of the signal on XTAL1.) With a 16–MHz crystal, one
state time equals 125 ns. Because the device can operate at many frequencies, this
manual defines time requirements in terms of state times rather than in specific
units of time.
A 16–bit unit of data. In memory, a word comprises two contiguous bytes.
TSC80251
glossary.3