sh6612a SinoWealth Micro-Electronics Corp. Ltd, sh6612a Datasheet - Page 4

• Manufacturer Part Number: sh6612a
• Description: 2k 4-bit Microcontroller With Lcd Driver
• Manufacturer: SinoWealth Micro-Electronics Corp. Ltd

3. RAM
Built-in SRAM contains of general-purpose data memory, LCD RAM and system register.
(a) RAM Addressing
Data memory and system register can be accessed in one instruction by direct addressing. The following is the memory
allocation map:
$000 - $01F: System register and I/O
$020 - $11F: Data memory (256 × 4 bits, divided into 2 banks).
$300 - $319: LCD RAM space (26 × 4 bits).
(b) Data Memory
Data memory is organized as 256 X 4 bits ($020 - $11F). Because of its static nature, the RAM can keep data after the CPU
enters STOP or HALT.
(c) The configuration of system register:
$0C
$0D
$0A
$0B
$0E
$0F
$1F
$00
$02
$03
$04
$05
$06
$07
$08
$09
$10
$11
$12
$13
$14
$15
$16
$01
~
TBR.3
DPL.3
T0H.3
T1H.3
T0L.3
T1L.3
INX.3
AEC3
IRQX
Bit 3
PA.3
PB.3
PC.3
PD.3
O/S
IEX
-
-
-
-
-
-
-
-
LCDOFF
DPM.2
IRQT0
DPH.2
T0M.2
T1M.2
TBR.2
T0H.2
T1H.2
DPL.2
AEC2
T0L.2
T1L.2
INX.2
PC.2
PD.2
Bit 2
IET0
PA.2
PB.2
-
-
-
-
DPM.1
IRQT1
DPH.1
T0M.1
T1M.1
TBR.1
DPL.1
T0H.1
T1H.1
AEC1
T0L.1
T1L.1
INX.1
Bit 1
PA.1
PB.1
PC.1
PD.1
IET1
HLM
B1
-
-
-
DPM.0
DPH.0
T0M.0
T1M.0
TBR.0
DPL.0
T0H.0
T1H.0
DUTY
T0L.0
T1L.0
AEC0
IRQP
INX.0
PC.0
PD.0
Bit 0
PA.0
PB.0
PAM
IEP
B0
-
-
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
4/24
R
-
-
Interrupt enable flags
Interrupt request flags
Bit0-2: Timer0 Mode register
Bit0-2: Timer1 Mode register
Timer0 load/counter register low nibble
Timer0 load/counter register high nibble
Timer1 load/counter register low nibble
Timer1 load/counter register high nibble
PORTA
PORTB
PORTC
PORTD
Reserved
Bonding option
Table Branch Register
Pseudo index register
Data pointer for INX low nibble
Data pointer for INX middle nibble
Data pointer for INX high nibble
Bit0: set PA.1, PA.2 as Alarm O/P
Bit1: HEAVY LOAD Mode
Bit2: LCD off
Bit3: set LCD segment as outport
Alarm Envelope Control
Bit0: change LCD duty to 1/4 duty, 1/3 bias
Reserved
Remarks
SH6612A
Ver 0.3