SyncMOS Technologies International, Inc.
SM89S16R1
8-Bits Micro-controller
With 64KB Flash ROM & 1KB RAM & RTC & ADC & PWM & PDWU embedded
Pin Description
MNEMONIC
VDD
P0.0 – P0.7
PDIP 40 pin
40
39,38,37,36
35,34,33,32
PQFP 44 Pin
38
37,36,35,34
33,32,31,30
PLCC 44 pin
44
43,42,41,40
39,38,37,36
Names and Functions
Power supply:
+5V or +3.3V power supply pin during normal operations
and power saving modes.
Port 0:
Port 0 is an open-drain, bidirectional I/O port. Port 0 pins
that have 1s written to them become floating and can be
used as high- impedance inputs. Port 0 is also the
multiplexed low-order address and data bus during accesses
to external program and data memory. In this application, it
uses strong internal pull-ups when emitting 1s.
Port Pin
Alternative function
P0.0
AD0
P0.1
AD1
P0.2
AD2
P0.3
AD3
P0.4
AD4
P0.5
AD5
P0.6
AD6
P0.7
AD7
Port 1:
An 8-bits bidirectional I/O port with internal pull-ups on all
pins. Port 1 pins that have 1s written to them are pulled high
by the internal pull-ups and can be used as inputs. As inputs,
port 1 pins that are externally pulled low will source current
because of the internal pull-ups. (See DC Electrical
Characteristics: IIL).
Port Pin
Alternative function
P1.0
T2: TIMER2 clock output
P1.1
T2EX: TIMER2 reload/capture DIR.
P1.4
PWM0: PWM channel 0 output
P1.5
PWM1: PWM channel 1 output
Reset:
A high on this pin for two machine cycles while the
oscillator is running, resets the device. An internal resistor to
VSS permits a power-on reset using only an external
capacitor to VCC.
Port 2:
Port 2 is an 8-bits bidirectional I/O port with internal
pull-ups. Port 2 pins that have 1s written to them are pulled
high by the internal pull-ups and can be used as inputs. As
inputs, port 2 pins that are externally being pulled low will
source current because of the internal pull-ups. (See DC
Electrical Characteristics: IIL). Port 2 emits the high-order
address byte during fetches from external program memory
and during accesses to external data memory that uses
16-bits addresses (MOVX @DPTR). In this application, it
uses strong internal pull-ups when emitting 1s. During
accesses to external data memory that uses 8-bits addresses
(MOV @Ri), port 2 emits the contents of the P2 special
function register.
Port Pin
Alternative function
P2.0
A8
P2.1
A9
P2.2
A10
P2.3
A11
P2.4
A12/ADC0
P2.5
A13/ADC1
P2.6
A14/ADC2
P2.7
A15/ADC3
P1.0 – P1.7
1,2,3,4,
5,6,7,8
40,41,42,43,
44,1,2,3
2,3,4,5,
6,7,8,9
RST
9
4
10
P2.0 – P2.7
21,22,23,24,
25,26,27,28
18,19,20,21
22,23,24,25
24,25,26,27,
28,29,30,31
MNEMONIC
PDIP 40 pin
PQFP 44 Pin
PLCC 44 pin
4
Names and Functions
Ver 2.1 SM89S16R1 08/2006
Specifications subject to change without notice contact your sales representatives for the most recent information.
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
