SyncMOS Technologies International, Inc.
SM5964A
8-Bit Micro-controller
With 64KB ISP Flash & TWSI & PWM & 1KB RAM embedded
Internal Data memory
The Data memory of SM5964A consists of 1024 bytes internal data memory (256 bytes standard RAM and 768 bytes
AUX-RAM). The AUX-RAM is enable by SCONF.1 ($BF.1), and read/write by MOVX
Internal RAM Control Register (RCON, $85)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
RAMS1
RAMS0
SM5964A has 768 byte on-chip RAM which can be accessed by external memory addressing method only. (By
instruction MOVX). The address space of instruction MOVX @Rn is determined by bit 1 and bit 0 (RAMS1, RAMS0) of
RCON. The default setting of RAMS1, RAMS0 bits is 00 (page0).
Pulse Width Modulation (PWM)
The PWM output pins are P1.2 and P1.3.
The PWM clock is {FOSC/ (2xDivider)}, the PWM output frequency is {(PWM clock)/32} at 5 bits resolution and
{(PWM clock)/256} at 8 bits resolution.
The PWM SFR has shown as below:
PWMC [0:1] ($D3H and $D4H)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
PBS
Bit1
PFS1
Bit0
PFS0
PBS: when set, the PWM is 5 bits resolution.
PFS [1:0]: The PWM clock divider select.
PFS1
PFS0
PWM clock divider select
0
0
1
1
0
1
0
1
2
4
8
16
PWMD [0:1] ($B3H and $B4H)
Bit7
PWMD.7
Bit6
PWMD.6
Bit5
PWMD.5
Bit4
PWMD.4
Bit3
PWMD.3
Bit2
PWMD.2
Bit1
PWMD.1
Bit0
PWMD.0
Two-Wire Series Interface (TWSI)
The TWSI module uses the SCL (clock) and the SDA (data) line to communicate with external TWSI interface between
other TWSI parts. The speed can up to 400K bps (max.) by software setting the TWSIFS [2:0].
The TWSI module used SFR shown as below
TWSI Status Register:
TWSIS ($C0H)
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
RXIF
TXIF
TFIF
NAKIF
RXAK
MASTER
TXAK
RXIF: The data Receive Interrupt Flag (RXIF) is set after the TWSIRxD (TWSI Receive Data Buffer) is loaded with a
newly receive data.
TXIF: The data Transmit Interrupt Flag (TXIF) is set when the data of the TWSITxD (TWSI Transmit Data Buffer) is
downloaded to the shift register or the TWSIA is downloaded to the shift register at Master Transmit mode.
TFIF: The Transmit Fail Interrupt Flag is set when the data transmit fail.
Specifications subject to change without notice contact your sales representatives for the most recent information.
Ver 2.3 SM5964A 10/2006
20
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
