M66271FP Datasheet, PDF (9/28 Pages) Mitsubishi Electric Semiconductor – OPERATION PANEL CONTROLLER

M66271FP
Difference in VRAM between 8-bit and 16-bit MPU
(1) When accessing built-in VRAM by 8-bit MPU
(MPUSEL = "L", BHE = "H", HWR = "H": set)
A <13:0>
MCS
LWR
D <7:0>
RD
A <13:0>
CEC
WEC
VRAM
9600-byte
DI <7:0>
DO <7:0>
(2) When accessing built-in VRAM by 16-bit MPU
(2-1) In case MPU use A <0> and BHE for byte access
(MPUSEL = "H", HWR = "H": set)
A <13:1>
A <0>
MCS
LWR
D <7:0>
A <13:1>
A <0>
CEC
WEC
VRAM
4800-byte
(Lower byte)
DI <7:0>
DO <7:0>
(2-2) In case MPU use LWR and HWR for byte access
(MPUSEL = "H", BHE = "H", A <0> = "H": set)
A <13:1>
A <13:1>
MCS
LWR
D <7:0>
CEC
WEC
DI <7:0>
DO <7:0>
VRAM
4800-byte
(Lower byte)
BHE
D <15:8>
RD
A <13:1>
A <0>
VRAM
CEC
WEC
4800-byte
(Upper byte)
DI <15:8>
DO <15:8>
HWR
D <15:8>
RD
A <13:1>
CEC
WEC
DI <15:8>
VRAM
4800-byte
(Upper byte)
DO <15:8>
Figure 1 Difference in VRAM between 8-bit and 16-bit MPU
REJ03F0267-0200 Rev.2.00 Mar 18, 2008
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