Rainbow Electronics APC5890 - Manual (Page 3)

APLUS INTEGRATED CIRCUITS INC.
APC5890
www.aplusinc.com.tw TEL : 886-2-2782-9266 3
2. PIN DESCRIPTION :
P
IN
N
AME
I/O D
ESCRIPTION
RESET I R
ESET INPUT
. A
CTIVE LOW
.
PWM1,PWM2 O PWM
OUTPUT
.
DAC O O
UTPUT FROM
D/A
CONVERTER
.
XOSC1 I C
RYSTAL OSCILLATOR INPUT PIN
.
XOSC2 O C
RYSTAL OSCILLATOR OUTPUT PIN
.
CAP I C
APACITOR FOR
PLL
CIRCUIT
.
PA0-PA7 I/O
I/O
PORT
_
A PIN
0
TO
7. A
LSO AS EXTERNAL INTERRUPT
S
OURCE
.(
FALL EDGE TRIGGER
), I
NTERNAL PULL HIGH
.
PA8-PA12 IO I/O PORT _ A PIN 8 TO 12, I NTERNAL PULL HIGH .
PA13/ADC I/O I/O PORT _ A PIN 13 OR ANALOG SIGNAL INPUT .I NTERNAL PULL LOW .
PA14 I/O I/O
PORT
_
A PIN
14, I
NTERNAL PULL HIGH
.
PA15 I/O I/O PORT _ A PIN 15, I NTERNAL PULL HIGH .
PB0-PB5/BANK3-BANK8 O P
ORT
_
B OR
E
XTERNAL MEMORY BANK SELECT
PB6/EMEMRD O
P
ORT
_
B PIN
6
OR
E
XTERNAL
RAM
READ
(A CTIVE L OW ).
PB7/EXTRAM O
P ORT _ B PIN 7 OR E XTERNAL RAM SELECT PIN
(A
CTIVE
L
OW
)
PB8/EMEMWRL I/O
Port_b pin 8 or External RAM low byte write(Active Low),
Input at reset cycle, output at normal cycle, internal pull high.
PB9/EXTIRQ I/O
Port_b pin 9 or External IRQ input pin(rise edge trigger),
Input at reset cycle, output at normal cycle, internal pull low.
PB10/EMEMWRH O
Port_b pin 10 or External RAM high byte write(Active Low),
Input at reset cycle, output at normal cycle, Internal pull low.
PB11/EXTROMCS I/O
P ORT _ B PIN 11 ROM SELECT OR EXTERNAL ROM CHIP
SELECT
(A
CTIVE
L
OW
), I
NPUT AT RESET CYCLE
,
OUTPUT
AT NORMAL OPERATION
,
CYCLE
,
INTERNAL PULL HIGH
.
PC/EMEMAD I/O
EMEMAD: E
XTERNAL MEMORY
A
DDRESS
/D
ATA
I F IT IS ADDRESS THEN EMEMA0~EMEMA12 IS A1~A13.
EMEMA13~EMEMA15 IS BANK0~BANK2.
ALE I/O
E XTERNAL MEMORY ADDRESS LATCH ENABLE .
I NPUT AT RESET CYCLE , OUTPUT AT NORMAL OPERATION
CYCLE
,
INTERNAL PULL HIGH
.
VDD1-VDD4 I D IGITAL POWER INPUT .
GND1-GND4 I D
IGITAL GROUND
.
PLLVDD,PLLGND I P
OWER AND GROUND FOR
PLL
CIRCUIT
.
DACVDD,DACGND I P OWER AND GROUND FOR DAC CIRCUIT .