en.wikipedia.org/wiki/Intel_MCS-48
3 corrections found
2× 8-bit timers
The 8748 and 8749 had one 8-bit timer/event counter, not two.
Full reasoning
Intel's own datasheets and user manuals describe the 8748/8749 MCS-48 family as having an 8-bit timer/counter or an 8-bit timer/event counter—singular. I could not find an Intel source describing these parts as having two 8-bit timers. So this table entry is incorrect on the timer count.
2 sources
- MCS-48 Microcomputer User's Manual July 1977 98-270B
The Intel 8048/8748/8035 is a totally self-sufficient 8-bit parallel computer ... The 8048 contains a 1Kx8 program memory, a 64 x 8 RAM data memory, 27 I/O lines, and an 8-bit timer/counter ...
- intel®P8748H/P8749H
The family contains 27 I/O lines, an 8-bit timer/counter, and on-board oscillator/clock circuits.
27 I/O ports
The 8049 had 27 I/O lines, not 27 separate I/O ports.
Full reasoning
Intel's own MCS-48 documentation describes the 8049 as having 27 I/O lines and one 8-bit timer/counter. That means the article's wording here is off by a lot: it is not 27 ports, but 27 individual I/O lines/pins. Intel manuals consistently use the singular phrase "27 I/O lines" for the 8049 family.
2 sources
- MCS-48 Family of Single Chip Microcomputers User's Manual
The 8049 contains a 2K x 8 program memory, a 128 x 8 RAM data memory, 27 I/O lines, and an 8-bit timer/counter in addition to on board oscillator and clock circuits.
- MCS-48 Microcomputer User's Manual
The 8049 contains a 2K x 8 program memory, a 128 x 8 RAM data memory, 27 I/O lines, and an 8-bit timer/counter in addition to on board oscillator and clock circuits.
27× I/O ports
These MCS-48 parts were specified with 27 I/O lines, not 27 I/O ports.
Full reasoning
Intel documentation for the MCS-48 family describes these chips as having 27 I/O lines. Calling them "27 I/O ports" is incorrect terminology and overstates the interface count: the devices do not provide 27 separate ports.
2 sources
- MCS-48 Microcomputer User's Manual July 1977 98-270B
The head of the family is the 8048 microcomputer which contains the following functions in a single 40 pin package: ... 27 I/O Lines ... 8-Bit Timer/Event Counter.
- MCS-48 Family of Single Chip Microcomputers User's Manual
The 8049 contains a 2K x 8 program memory, a 128 x 8 RAM data memory, 27 I/O lines, and an 8-bit timer/counter in addition to on board oscillator and clock circuits.