SyncMOS Technologies Inc.
SM89T16R1
8-Bits Micro-controller
With 64KB Flash ROM & IKB RAM & Two UART & RTC & ADC & PWM embedded
Pin Description
MNEMONIC
VDD
P0.0 – P0.7
DIP 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:
+3.3V and +5V 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).
Alternate function of SM89T16R1 include:
Port Pin
Alternative function
P1.0
T2: TIMER2 clock output
P1.1
T2EX: TIMER2 reload/capture DIR.
P1.2
RxD1: UART1 input
P1.3
TxD1: UART1 output
P1.4
PWM0: PWM channel 0 output
INT2: rising edge trigger
P1.5
PWM1: PWM channel 1 output
#INT3: falling edge trigger
P1.6
INT4: rising edge trigger
P1.7
#INT5: falling edge trigger
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
Specifications subject to change without notice contact your sales representatives for the most recent information.
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SM89T16R1 V1.0 JANUARY 2005
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
