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PC87306 데이터시트(PDF) 81 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 PC87306
상세설명  PC87306 SuperI/OTM Enhanced Sidewinder Lite Floppy Disk Controller, Keyboard Controller, Real-Time Clock, Dual UARTs, Infrared Interface, IEEE 1284 Pa
PDF  110 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87306 데이터시트(HTML) 81 Page - National Semiconductor (TI)

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100 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 10-1 shows the relationships of
these functional blocks and
Figure 10-2 displays the inter-
face between the PC87306 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 KBC is enabled when bit 0 of KRR is 1 It is guaranteed
to work with SYSCLK up to 16 MHz (when KRR7 e 1)
The KBC is software compatible with the 8042AH industry
standard
keyboard
controller
as
well
as
National’s
PC87911 The PC87306 can execute code previously writ-
ten for an 8042 without further development
TLC12379 – 49
FIGURE 10-1 Keyboard Controller Functional Block Diagram
81



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