AT89C5130A-RDTIM Atmel, AT89C5130A-RDTIM Datasheet - Page 88
AT89C5130A-RDTIM
Manufacturer Part Number
AT89C5130A-RDTIM
Description
IC 8051 MCU FLASH 16K USB 64VQFP
Manufacturer
Atmel
Series
AT89C513xr
Datasheet
1.AT89C5130A-PUTUM.pdf
(188 pages)
Specifications of AT89C5130A-RDTIM
Core Processor
C52X2
Core Size
8-Bit
Speed
48MHz
Connectivity
I²C, SPI, UART/USART, USB
Peripherals
LED, POR, PWM, WDT
Number Of I /o
34
Program Memory Size
16KB (16K x 8)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
1.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP, 64-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Data Converters
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17. Keyboard Interface
17.1
17.2
17.2.1
88
Introduction
Description
AT89C5130A/31A-M
Interrupt
The AT89C5130A/31A-M implements a keyboard interface allowing the connection of a 8 x n
matrix keyboard. It is based on 8 inputs with programmable interrupt capability on both high or
low level. These inputs are available as an alternate function of P1 and allow to exit from idle
and power down modes.
The keyboard interface communicates with the C51 core through 3 special function registers:
KBLS, the Keyboard Level Selection register (Table 17-3), KBE, The Keyboard interrupt Enable
register (Table 17-2), and KBF, the Keyboard Flag register (Table 17-1).
The keyboard inputs are considered as 8 independent interrupt sources sharing the same inter-
rupt vector. An interrupt enable bit (KBD in IE1) allows global enable or disable of the keyboard
interrupt (see Figure 17-1). As detailed in Figure 17-2 each keyboard input has the capability to
detect a programmable level according to KBLS.x bit value. Level detection is then reported in
interrupt flags KBF.x that can be masked by software using KBE.x bits.
This structure allow keyboard arrangement from 1 by n to 8 by n matrix and allow usage of P1
inputs for other purpose.
Figure 17-1. Keyboard Interface Block Diagram
Figure 17-2. Keyboard Input Circuitry
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
P1:x
Input Circuitry
Input Circuitry
Input Circuitry
Input Circuitry
Input Circuitry
Input Circuitry
Input Circuitry
Input Circuitry
Vcc
Internal Pull-up
KBLS.x
0
1
KBF.x
KBD
IE1.0
KBE.x
Keyboard Interface
Interrupt Request
KBDIT
4337K–USB–04/08
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