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PC87303 데이터시트(PDF) 85 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 PC87303
상세설명  PC87303VUL SuperI/OTM Sidewinder Lite Floppy Disk Controller, Keyboard Controller, Real-Time Clock, Dual UARTs, IEEE 1284 Parallel Port, and IDE Inter
PDF  114 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87303 데이터시트(HTML) 85 Page - National Semiconductor (TI)

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90 Keyboard Controller and Real-Time Clock
The keyboard controller (KBC) is a general purpose 8-bit
microcontroller It consists of 256 Bytes of data memory and
2 kBytes of Read-Only Memory (ROM) two 8-bit IO ports a
three register system interface an 8-bit timercounter and
facilities for both binary and Binary Coded Decimal (BCD)
arithmetic
Figure 9-1 shows the relationships of these func-
tional blocks and
Figure 9-2 displays the interface between
the PC87303 and a host system
The ROM may be custom programmed during manufacture
according to customer requirements These versions of de-
vices are available by special order For applications which
require program development capabilities the RAM-based
PC87323 SuperIO Sidewinder is recommended
The IO ports provide up to 18 programmable lines for dedi-
cated control functions Four lines may be used to expand
the number of IO ports
The KBC is software compatible with the 8042AH industry
standard
keyboard
controller
as
well
as
National’s
PC87911 The PC87303 can execute code previously writ-
ten for an 8042 without further development
The following sections will describe in detail the operation of
the functional blocks shown in
Figure 9-1
The RTC supports a 100-year calendar as well as a time-of-
day clock with alarm features and battery backup
TLC12074 – 39
FIGURE 9-1 Keyboard Controller Functional Block Diagram
85



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