SM89S16R1_06 Datasheet, PDF (21/29 Pages) SyncMOS Technologies,Inc – 8-Bits Micro-controller With 64KB Flash ROM & 1KB RAM & RTC & ADC & PWM & PDWU embedded

SyncMOS Technologies International, Inc.
SM89S16R1
8-Bits Micro-controller
With 64KB Flash ROM & 1KB RAM & RTC & ADC & PWM & PDWU embedded
Pulse Width Modulation (PWM)
The PWM output pins are P1.4 and P1.5.
The PWM clock is {Fosc/ (2xDivider)}, the PWM output frequency is {(PWM clock)/32} at 5 bits resolution and
{(PWM clock)/256} at 8 bits resolution.
The PWM SFR show as below:
PWMC ($D3H and $D4H)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
PBS
PFS1
PFS0
PBS: when set, the PWM is 5 bits resolution.
PFS [1:0]: The PWM clock divider select.
PFS1
0
0
1
1
PFS0
0
1
0
1
PWM clock divider select
2
4
8
16
PWMD ($B3H and $B4H)
Bit7
Bit6
Bit5
PWMD.7 PWMD.6 PWMD.5
Bit4
PWMD.4
Bit3
PWMD.3
Bit2
PWMD.2
Bit1
PWMD.1
Bit0
PWMD.0
Real Time Clock (RTC)
The on-chip RTC keeps time of second and minute functions. Its time base is a 32.768 KHz crystal between pins
X32OUT (alternate function of ALE) and X32IN (alternate function of PSEN). The RTC maintains time to a second.
It also allows a user to read (and write) seconds and minute.
The RTC function used SFR descriptor as below:
RTCS ($A1H)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
RTCen
Stable
SEC.5
SEC.4
SEC.3
SEC.2
SEC.1
SEC.0
RTCen: When set to ‘1’, enable the enable RTC function. When this bit set, the ALE and PSEN pins output will
disable, and the ALE and PSEN pins will use for RTC function as X32OUT and X32IN.
Stable: Read only. The Stable bit will set to 1 when the RTC module stable. Please wait 2 seconds before used the
RTC function.
SEC [5:0]: show the current second counter at RTC function. The range is from 00H to 3BH.
RTCC ($A2H)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
INT_SEL1 INT_SEL0 MIN.5
MIN.4
MIN.3
MIN.2
MIN.1
INT_SEL [1:0]: the interrupt distribution selection bit, the interrupt vector is 43H.
00: the interrupt is set as 0.5 second
01: the interrupt is set as 1 second
10: the interrupt is set as 30 second
11: the interrupt is set as 60 second
MIN [5:0]: show the current minute counter at RTC function. The range is from 00H to 3BH.
Bit0
MIN.0
Specifications subject to change without notice contact your sales representatives for the most recent information.
Ver 2.1 SM89S16R1 08/2006
21