參數(shù)資料
型號(hào)： M38503M4A-XXXSP
元件分類(lèi)： 微控制器/微處理器
英文描述： 8-BIT, MROM, 6.25 MHz, MICROCONTROLLER, PDIP42
封裝： 13 X 36.72 MM, 1.78 MM PITCH, PLASTIC, SDIP-42
文件頁(yè)數(shù)： 23/59頁(yè)
文件大?。?/td> 885K
代理商： M38503M4A-XXXSP
Rev.2.13
Apr 17, 2009
Page 3 of 56
REJ03B0125-0213
3850 Group (Spec.A QzROM version)
PIN DESCRIPTION
Table 1
Pin description
Pin
Name
Function
Function except a port function
VCC, VSS
Power source
Apply voltage of 1.8 V
5.5 V to VCC, and 0 V to VSS.
CNVSS
CNVSS input
This pin controls the operation mode of the chip and is shared with the VPP pin which is the
power source input pin for programming the built-in QzROM.
Normally connected to VSS.
VREF
Reference
voltage
Reference voltage input pin for A/D converter.
AVSS
Analog power
source
Analog power source input pin for A/D converter.
Connect to VSS.
RESET
Reset input
Reset input pin for active “L”.
XIN
Clock input
Input and output pins for the clock generating circuit.
Connect a ceramic resonator or quartz-crystal oscillator between the XIN and XOUT pins to set
the oscillation frequency.
When an external clock is used, connect the clock source to the XIN pin and leave the XOUT pin
open.
XOUT
Clock output
P00/SIN2
P01/SOUT2
P02/SCLK2
P03/SRDY2
I/O port P0
8-bit CMOS I/O port.
I/O direction register allows each pin to be individually
programmed as either input or output.
CMOS compatible input level.
CMOS 3-state output structure.
Pull-up control is enabled in a byte unit.
P10 to P17 (8 bits) are enabled to output large current
for LED drive.
Serial I/O2 function pin
P04/AN5
P07/AN8
A/D converter input pin
P10-P17
I/O port P1
P20/XCOUT
P21/XCIN
I/O port P2
8-bit CMOS I/O port.
I/O direction register allows each pin to be individually
programmed as either input or output.
CMOS compatible input level.
P20, P21, P24, to P27: CMOS3-state output structure.
P22, P23: N-channel open-drain structure.
Pull-up control of P20, P21, P24
P27 is enabled in a
byte unit.
Sub-clock generating circuit I/O
pins (connect a resonator)
P22
P23
P24/RXD
P25/TXD
P26/SCLK1
Serial I/O1 function pin
P27/CNTR0/SRDY1
Serial I/O1 function pin
Timer X function pin
P30/AN0
P34/AN4 I/O port P3
5-bit CMOS I/O port with the same function as port P0.
CMOS compatible input level.
CMOS 3-state output structure.
Pull-up control is enabled in a bit unit.
A/D converter input pin
P40/CNTR1
I/O port P4
5-bit CMOS I/O port with the same function as port P0.
CMOS compatible input level.
CMOS 3-state output structure.
Pull-up control is enabled in a bit unit.
Timer Y function pin
P41/INT0
P42/INT1
Interrupt input pins
P43/INT2/SCMP2
Interrupt input pin
SCMP2 output pin
P44/INT3/PWM
Interrupt input pin
PWM output pin
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