參數(shù)資料
型號(hào): ST92195C8T1/XXX
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 16-BIT, OTPROM, 24 MHz, MICROCONTROLLER, PQFP64
封裝: TQFP-64
文件頁(yè)數(shù): 168/250頁(yè)
文件大?。?/td> 3010K
代理商: ST92195C8T1/XXX
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ST92195 ST92T195 ST92E195 - DEVICE ARCHITECTURE
2 DEVICE ARCHITECTURE
2.1 CORE ARCHITECTURE
The ST9 Core or Central Processing Unit (CPU)
features a highly optimised instruction set, capable
of handling bit, byte (8-bit) and word (16-bit) data,
as well as BCD and Boolean formats; 14 address-
ing modes are available.
Four independent buses are controlled by the
Core: a 16-bit Memory bus, an 8-bit Register data
bus, an 8-bit Register address bus and a 6-bit In-
terrupt/DMA bus which connects the interrupt and
DMA controllers in the on-chip peripherals with the
Core.
This multiple bus architecture affords a high de-
gree of pipelining and parallel operation, thus mak-
ing the ST9 family devices highly efficient, both for
numerical calculation, data handling and with re-
gard to communication with on-chip peripheral re-
sources.
2.2 MEMORY SPACES
There are two separate memory spaces:
– The Register File, which comprises 240 8-bit
registers, arranged as 15 groups (Group 0 to E),
each containing sixteen 8-bit registers plus up to
64 pages of 16 registers mapped in Group F,
which hold data and control bits for the on-chip
peripherals and I/Os.
– A single linear memory space accommodating
both program and data. All of the physically sep-
arate memory areas, including the internal ROM,
internal RAM and external memory are mapped
in this common address space. The total ad-
dressable memory space of 4 Mbytes (limited by
the size of on-chip memory and the number of
external address pins) is arranged as 64 seg-
ments of 64 Kbytes. Each segment is further
subdivided into four pages of 16 Kbytes, as illus-
trated in Figure 1. A Memory Management Unit
uses a set of pointer registers to address a 22-bit
memory field using 16-bit address-based instruc-
tions.
2.2.1 Register File
The Register File consists of (see Figure 2):
– 224 general purpose registers (Group 0 to D,
registers R0 to R223)
– 6 system registers in the System Group (Group
E, registers R224 to R239)
– Up to 64 pages, depending on device configura-
tion, each containing up to 16 registers, mapped
to Group F (R240 to R255), see Figure 3.
Figure 7. Single Program and Data Memory Address Space
3FFFFFh
3F0000h
3EFFFFh
3E0000h
20FFFFh
02FFFFh
020000h
01FFFFh
010000h
00FFFFh
000000h
8
7
6
5
4
3
2
1
0
63
62
2
1
0
Address
16K Pages
64K Segments
up to 4 Mbytes
Data
Code
255
254
253
252
251
250
249
248
247
9
10
11
21FFFFh
210000h
133
134
135
33
Reserved
132
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