SM8951B Datasheet, PDF (12/18 Pages) SyncMOS Technologies,Inc – 8-Bits Micro-controller

SyncMOS Technologies International, Inc.
SM8951B
8-Bits Micro-controller
With4KBFlashROM&128bytesRAM embedded
ALE
/PSEN
/RD
PORT0
PORT2
ALE
/PSEN
/WR
PORT0
PORT2
t _WHLH
t _LLDV
t _LLWL
t _RLRH
t _AVLL
t _LLAX
A0 - A7 (RI or DPL)
t _RLDV
t _RLAZ
t _RHDZ
t _RHDX
DATA IN
t _AVDV
t _AVWL
A8 - A15 of DPH or PORT2
A0 - A7 (PCL)
A8 - A15 (PCH)
Figure 8 External Data Memory read cycle
INSTR IN
t_WHLH
t_LLWL
t_WLWH
t_AVLL
t_LLAX
A0 - A7 (RI or DPL)
t_QVWH
t_QVWX
t_WHQX
DATA OUT
t_AVWL
A8 - A15 of DPH or PORT2
A0 - A7 (PCL)
INSTR IN
A8 - A15 (PCH)
Figure 9 External Data Memory write cycle
Instruction
0
1
2
3
4
5
6
7
ALE
CLOCK
t_XLXL
TXD
t_QVXH
t_XHQX
0
1
2
3
4
5
6
RxD
t_XHDV
t_XHDX
VALID
VALID
VALID
VALID
VALID VALID VALID
Figure10 UART waveform in Shift Register MODE
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M022Ver:BSM8951B
12
8
7
Set_RI
VALID
06/2009