SM89T16R1 Datasheet, PDF (5/34 Pages) SyncMOS Technologies,Inc – 8-Bits Micro-controller With 64KB Flash ROM & IKB RAM & Two UART & RTC & ADC & PWM embedded

SyncMOS Technologies Inc.
SM89T16R1
8-Bits Micro-controller
With 64KB Flash ROM & IKB RAM & Two UART & RTC & ADC & PWM embedded
MNEMONIC DIP 40 pin PQFP 44 Pin PLCC 44 pin
Names and Functions
P3.0 – P3.7
10,11,12,13
14,15,16,17
5,7,8,9,
10,11,12,13
11, 13,14,15,
16,17,18,19
Port 3:
Port 3 is an 8-bits bidirectional I/O port with internal pull-ups. Port 3 pins
that have 1s written to them are pulled high by the internal pull-ups and
can be used as inputs. As inputs, port 3 pins that are externally being
pulled low will source current because of the pull-ups. (See DC Electrical
Characteristics: IIL). Port 3 also serves the special features.
Port Pin Alternative function
P3.0
RxD UART input
P3.1
TxD UART output
P3.2
#EX0 external interrupt 0
P3.3
#EX1 external interrupt 1
P3.4
T0: Timer 0 external input
P3.5
T1: Timer 1 external input
P3.6
#WR External data memory write strobe
P3.7
#RD External data memory read strobe
ALE/X32OUT 30
27
33
Address Latch Enable:
Output pulse for latching the low byte of the address during an access to
external memory. In normal operation, ALE is emitted twice every
machine cycle, and can be used for external timing or clocking. Note that
one ALE pulse is skipped during each access to external data memory.
Setting SFR SCONF.0 can disable ALE. With this bit set, ALE will be
active only during a MOVX instruction.
X32OUT: The 32.768KHz crystal output for RTC function.
#PSEN/X32IN 29
26
32
Program Store Enable:
The read strobe to external program memory. When executing code from
the external program memory, #PSEN is activated twice each machine
cycle, except that two #PSEN activations are skipped during each access
to external data memory. #PSEN is not activated during fetches from
internal program memory.
X32IN: The 32.768KHz crystal input for RTC function.
#EA
31
29
35
External Access Enable:
#EA must be externally held low to enable the device to fetch code from
external program memory locations. If #EA is held high, the device
executes from internal program memory.
XTAL1
19
15
21
Crystal 1:
Input to the inverting oscillator amplifier and input to the internal clock
generator circuits.
XTAL2
18
14
20
Crystal 2:
Output from the inverting oscillator amplifier.
SFR Mapping
The special function register of SM89T16R1 fall into the following categories
z C51 CORE register: ACC, B, DPL, DPH, PSW, SP
z I/O ports: P0,P1, P2, P3, P4
z Timer/Counter register: T2CON, T2MOD, TCON, TMOD, TH0, TH1, TH2, TL0, TL1, TL2, RCA2PL,
RCAP2H
z The Second DPTR register: DPS, DPH1, DPL1
z UART I/O register: SBUF, SCON
z UART1 I/O register: SBUF1, SCON1
z ADC register: ADCSC, ADCD, P2CON
z Power and system control register: PCON, SCONF
z Interrupt system register: IP, IE, IP1, IE1, IFR
z Expand External Interrupt register: EIE, EIP, EXIF
z RTC register: RTCC, RTCS
z PWM output register: PWMC0, PWMC1, PWMD0, PWMD1, P1CON
z PMM (Power Management) register: PMR
Specifications subject to change without notice contact your sales representatives for the most recent information.
SM89T16R1 V1.0 JANUARY 2005
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