NAD C 425, Service Manual

Page: 16 / 32

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Main Board
U201: P89LCP936
ACCELERATED 2-CLOCK 80C51 CPU
4 kb/8 kB/16 kB
CODE FLASH
256-BYTE
DATA RAM
PORT 2
CONFIGURABLE I/Os
PORT 1
CONFIGURABLE I/Os
PORT 0
CONFIGURABLE I/Os
KEYPAD
INTERRUPT
PROGRAMMABLE
OSCILLATOR DIVIDER
CPU
clock
CONFIGURABLE
OSCILLATOR
ON-CHIP
RC
OSCILLATOR
internal bus
CRYSTAL
OR
RESONATOR
POWER MONITOR
(POWER-ON RESET,
BROWNOUT RESET)
UART
ANALOG
COMPARATORS
512-BYTE
AUXILIARY RAM
I
2
C-BUS
512-BYTE
DATA EEPROM
(P89LPC935/936)
PORT 3
CONFIGURABLE I/Os
CCU (CAPTURE/
COMPARE UNIT)
(P89LPC935/936)
P89LPC933/934/935/936
WATCHDOG TIMER
AND OSCILLATOR
TIMER 0
TIMER 1
REAL-TIME CLOCK/
SYSTEM TIMER
SPI
ADC1/DAC1
ADC0/DAC0
(P89LPC935/936)
P3[1:0]
P2[7:0]
P1[7:0]
P0[7:0]
X2
X1
TXD
RXD
SCL
SDA
T0
T1
CMP2
CIN2B
CIN2A
CMP1
CIN1A
CIN1B
OCA
OCB
OCC
OCD
ICA
AD10
AD11
AD12
AD13
DAC1
AD00
AD01
AD02
AD03
DAC1
ICB
SPICLK
MOSI
MISO
SS
P89LPC935FDH
P89LPC936FDH
1
2
3
4
5
6
7
8
9
10
11
12
13
14
16
15
18
17
20
19
22
21
24
23
26
25
28
27 P2.0/ICB/DAC0/AD03
P2.1/OCD/AD02
P0.0/CMP2/KBI0/AD01
P1.7/OCC/AD00
P1.6/OCB
P1.5/RST
V
SS
P3.1/XTAL1
P3.0/XTAL2/CLKOUT
P1.4/INT1
P1.3/INT0/SDA
P1.2/T0/SCL
P2.2/MOSI
P2.3/MISO
P2.7/ICA
P2.6/OCA
P0.1/CIN2B/KBI1/AD10
P0.2/CIN2A/KBI2/AD11
P0.3/CIN1B/KBI3/AD12
P0.4/CIN1A/KBI4/DAC1/AD13
P0.5/CMPREF/KBI5
V
DD
P0.6/CMP1/KBI6
P0.7/T1/KBI7
P1.0/TXD
P1.1/RXD
P2.5/SPICLK
P2.4/SS