Sanyo DCS-AVD8501 Service Manual page 60

IC BLOCK DIAGRAM & DESCRIPTION
IC500 M37903S4CHP (16-bit C-Mos Micro Computer)
Pin Name
V ,V Power supply input
CC SS
MD0 MD0
MD1 MD1
RESET Reset input
X Clock input
IN
X Clock output
OUT
External data bus width
BYTE
select input
Clock division select
CDSEL
input
AV , Analog power supply
CC
AV input
SS
V Reference voltage input
REF
P0 /A - Address (high-order)
0 16
P0 /A output
7 23
P1 /D -
0 0
Data (low-order) I/O
P1 /D
7 7
P2 /D - I/O port p2,
0 8
P2 /D Data (high-order) I/O
7 15
P3 - P3 I/O port P3
0 3
P4 - P4 I/O port P4
0 7
P5 - P5 I/O port P5
0 7
P6 - P6 I/O port P6
0 7
P7 - P7 I/O port P7
0 7
P8 - P8 I/O port P8
0 7
P10 /A - Address (low-order)
0 0
P10 A output
7 7
P11 /A - Address (middle-order)
0 8
P11 /A output
7 15
NMI Non-mask able interrupt
Note : The X -input-clock division select bit is used to determine whether the input clock to pin X
IN
Input/O
utput
---
Apply 5V ± 0.5V to Vcc, and 0V to Vss.
Input Connect this pin to Vcc.
Input Connect this pin to Vss.
Input The microcomputer is reset when Vss-level voltage is applied to this pin.
Input These are input and output pins of the internal clock generating circuit. Connect a ceramic or
quartz-crystal resonator between the X
Output clock source should be connected to the X
This pin determines whether the external data bus has an 8-bit width or 16-bit width for the
memory expansion mode or microprocessor mode. The width is 16 bits when V
Input
voltage is input, and 8 bits when V
resister setting, the external data bus for each of areas CS
This pin determines the X
Input
level at pin X .
IN
Power supply input pins for the A-D converter and the D-A converter. Connect AV
---
and AV to V externally.
SS SS
Input This is the reference voltage input pin for the A-D converter and the D-A converter.
Address (A -A ) is output. These pins also function as I/O port pins according to the resister
16 23
Output
setting.
The low-order 8 bits of data (D
I/O bit width, address (LA
time-sharing method, according to the resister setting.
When 8-bit external data bus is used.
Port P2 is an 8-bit I/O port. This port has an I/O direction resister, and each pin can be
I/O programmed for input or output. These pins enter the input mode at reset.
When 16-bit external data bus is used.
The high-order 8 bits of data (D
P30 functions as an input pin of RDY; and P31, P32. P33 function as the output pins of RD,
I/O BLW, BHW, respectively. P30 also functions as an I/O port pin according to the resister
setting. When the external data has a width of 8 bits, be BHW pin functions
P4 - P4 function as output or input pins of ALE, ø1, HLDA, HOLD, CS
0 4
I/O
I/O port pins, respectively. According to the resister setting, P4
pins, and P4 - P4
5 7
Port P5 is an 8-bit I/O port. This port has an I/O direction resister, and each pin can be
programmed for input or output. These pins enter the input mode at reset. These pins also
I/O
function as I/O pins for timers A0 - A3, output pins for the real-time output pins for the real-
time output, and input pins for the key-input interrupt.
Port P6 is an 8-bit I/O port. This port has an I/O direction resister, and each pin can be
programmed for input or output. These pins enter the input mode at reset. These pins also
I/O
function as I/O pins for timers A4, input pins for external interrupt inputs INT
pins for timers B0 - B2.
Port P7 is an 8-bit I/O port. This port has an I/O direction resister, and each pin can be
programmed for input or output. These pins enter the input mode at reset. These pins also
I/O
function as input pins for the A-D converter, output pins for the D-A converter, and input pins
for INT , INT , and INT
2 3
Port P8 is an 8-bit I/O port. This port has an I/O direction resister, and each pin can be
I/O programmed for input or output. These pins enter the input mode at reset.
These pins also function as I/O pins for UART0, UART1, and input pins for INT
Output Address (A -A ) is output.
0 7
Address (A -A ) is output. These pins also function as I/O port pins according to the resister
8 15
Output
setting.
Input This pin is for a non-mask able interrupt.
Description
and X
IN OUT
pin, and the X
IN
-level voltage is applied. When BYTE=V
CC
-input-clock division select bit's (note) state at reset and the input
IN
-D ) are input /output. When the external data bus has an 8-
0 7
-LA ) output and data (D
0 7 0
- D ) are input or output.
8 15
as output pins of CS - CS .
1 3
.
4
- 75 -
pins. When an external clock is used., the
pin s
OUT
to CS can have a width of 8 bits.
1 3
-D ) input/output can be performed with the
7
, and P4
0
- P4 also function as I/O port
0 3
- INT
0
is to be divided or not.
IN
-level
SS
level, by the
SS
to V ,
CC CC
- P4 as
5 7
, and input
2
and INT .
3 4