KK82C55 Просмотр технического описания (PDF) - Kodenshi Auk Co., LTD
Номер в каталоге
Компоненты Описание
производитель
KK82C55 Datasheet PDF : 22 Pages
| |||
KK82C55A
Interrupt Control Functions
When the KK82C55AN is programmed to operate in mode 1 or mode 2, control signals are provided that can be used as
interrupt request inputs to the CPU. The interrupt request signals, generated from port C, can be inhibited or enabled by
setting or resetting the associated INTE flip-flop, using the bit set/reset function of port C.
This function allows the Programmer to disallow or allow a specific I/O device to interrupt the CPU without affecting
any other device in the interrupt structure.
INTE flip-flop definition:
(BIT-SET) - INTE is SET - Interrupt enable
(BIT-RESET) – INTE is RESET - Interrupt disable
Note:
All Mask flip-flops are automatically reset during mode selection and device Reset.
Operating Modes
Mode 0 (Basic Input/Output). This functional configuration provides simple input and output operations for each of
the three ports. No “handshaking” is required, data is simply written to or read from a specified port.
Mode 0 Basic Functional Definitions:
• Two 8-bit ports and two 4-bit ports.
• Any port can be input or output.
• Outputs are latched.
• Inputs are not latched.
• 16 different Input/Output configurations are possible in this Mode.
MODE 0 (BASIC INPUT)
RD
INPUT
CS, A1, A0
tIR
tAR
tRR
tHR
tRA
D7-D0
tRD
tDF
7
Share Link: 