em6521 EM Microelectronic, em6521 Datasheet - Page 14

• Manufacturer Part Number: em6521
• Description: Mfp Version Of Em6621 Ultra Low Power Microcontroller With 4x20 Lcd Driver
• Manufacturer: EM Microelectronic

6
The EM6521 has:
- One 4-bit input port ( port A )
- One 4-bit input/output port. ( port B )
- One serial interface (port SP) also configurable as 4-bit I/O port
Pull resistors can be added to all this ports with metal (ROM version only) and/or register options.
6.1 Ports Overview
Table 6.1.1 Input and Output Ports Overview
Copyright © 2005, EM Microelectronic-Marin SA
Port
PA
[3:0]
PB
[3:0]
PS
[3:0]
Input and Output Ports
Mode
Input
Individual
input or
output
Serial I/O
or
port-wise
input /
output
R
Mask(M:) or Register(R:)
Option
M: Pull-up
M: Pull-down (default)
R: Pull(up/down) select
R: Debouncer or direct
R: + or - for IRQ-edge
R: Input reset
R: CMOS or
R: Pull-down on input
R: Pull-up on input
R: CMOS or
R: Pull-down on input
R: Pull-up on input
Nch. open drain output
input for IRQ requests
and Counter
and counter
combination
Nch open drain output
Function
-Input
-Bit-wise interrupt request
-Software test variable
-PA[3],PA[0] input for the
-PA[3] input for the
-Port A reset inputs
-Input or output
-PB[3] for the PWM output
-PB[2:0] for the Ck[16,11,1]
-Tristate output
-PSP[3], serial clock out
-PSP[2], serial data out
-PSP[1], serial status out
-PSP[0], serial data in
-PSP[3:0] 4-bit input/output
-Tristate output
event counter
output
millisecond counter
conditional jump
14
Bit-wise Multifunction on Ports
start/stop
counter
of MSC
PSP[3]
output
output
PA[3]
PB[3]
Serial
SCLK
10 bit
event
PWM
clock
clock
PSP[2]
Ck[16]
output
output
SOUT
PA[2]
PB[2]
Serial
data
-
-
www.emmicroelectronic.com
Ready or
Ready/CS
EM6521
PSP[1]
Ck[11]
output
PB[1]
PA[1]
CS
-
-
counter
PSP[0]
output
PA[0]
PB[0]
Serial
10 bit
event
clock
Ck[1]
input
data
SIN
-