參數(shù)資料
型號(hào)： Z86L75
廠商： ZiLOG, Inc.
英文描述： IR/Low-Voltage Microcontroller
中文描述： 紅外/低電壓微控制器
文件頁(yè)數(shù)： 22/61頁(yè)
文件大?。?/td> 349K
代理商： Z86L75
Z86L70/71/75/C71
IR/Low-Voltage Microcontroller
Zilog
1-22
P R E L I M I N A R Y
DS97LVO0500
RAM/Register File.
The register file (group 0) consists of
four I/O port registers, 236 general purpose registers, and
16 control and status registers (R0-R3, R4-R239, and
R240-R255, respectively), plus two expanded registers
group (Banks D and F). In the 4-bit mode, the register file
is divided into 16 working register groups, each occupying
16 continuous locations. The Register Pointer addresses
the starting location of the active working register group.
Note:
Registers E0-EF of Bank 0 are only accessed
through working registers and indirect addressing modes.
Stack.
The Z86L7X internal register file is used for the
stack. An 8-bit Stack Pointer (R255) is used for the internal
stack that resides in the general-purpose registers (R4-
R239).
Figure 15. Register Pointer
D7 D6 D5 D4 D3 D2 D1 D0
Expanded Register Bank
File Pointer
Working Register
Pointer
R253 RP
Default Setting After
Reset = 0000 0000
Figure 16. Register Pointer
The upper nibble of the register file address
provided by the register pointer specifies
the active working-register group
r7
r6
r5
r4
R253
I/O Ports
Specified Working
Register Group
The lower nibble
of the register
file address
provided by the
instruction points
to the specified
register
r3
r2
r1
r0
Register Group 0
7F
Register Group 1
6F
5F
4F
3F
2F
1F
0F
00
10
20
30
40
50
60
70
R15 to R0
R15 to R4 *
R3 to R0 *
* RP = 00: Selects Register Group 0, Working Register 0.
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