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參數(shù)資料
| 型號(hào)： | GMS82512Q |
| 廠商： | Hynix Semiconductor Inc. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 8位單晶片微控制器 |
| 文件頁數(shù)： | 30/110頁 |
| 文件大?。?/td> | 1980K |
| 代理商： | GMS82512Q |
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GMS81508B/16B/24B, GMS82512/16/24
MAY. 2001 Ver 2.0
27
8.3 Data Memory
Figure 8-8 shows the internal Data Memory space availa-
ble. Data Memory is divided into four groups, a user RAM,
control registers, Stack, and LCD memory.
Figure 8-8 Data Memory Map
User Memory
The GMS815xxB and GMS825xx have 448
×
8 bits for the
user memory (RAM).
Control Registers
The control registers are used by the CPU and Peripheral
function blocks for controlling the desired operation of the
device. Therefore, these registers contain control and sta-
tus bits for the interrupt system, the timer/ counters, analog
to digital converters and I/O ports. The control registers are
in address range of 0C0
H
to 0FF
H
.
Note that unoccupied addresses may not be implemented
on the chip. Read accesses to these addresses will in gen-
eral return random data, and write accesses will have an in-
determinate effect.
More detailed informations of each register are explained
in each peripheral section.
Note:
Write only registers can not be accessed by bit ma-
nipulation instruction. Do not use read-modify-write instruc-
tion. Use byte manipulation instruction, for example “LDM”.
Example; To write at CKCTLR
LDM
CLCTLR,#09H
;Divide ratio(
÷
32)
Stack Area
The stack provides the area where the return address is
saved before a jump is performed during the processing
routine at the execution of a subroutine call instruction or
the acceptance of an interrupt.
When returning from the processing routine, executing the
subroutine return instruction [RET] restores the contents of
the program counter from the stack; executing the interrupt
return instruction [RETI] restores the contents of the pro-
gram counter and flags.
The save/restore locations in the stack are determined by
the stack pointed (SP). The SP is automatically decreased
after the saving, and increased before the restoring. This
means the value of the SP indicates the stack location
number for the next save. Refer to Figure 8-4 on page 23.
User Memory
Control
Registers
or Stack Area
0000
H
00BF
H
00C0
H
00FF
H
0100
H
01FF
H
PAGE0
User Memory
PAGE1
When “G-flag=0”,
this page is selected
When “G-flag=1”
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