參數(shù)資料
型號(hào): M34556M8-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO42
封裝: 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42
文件頁數(shù): 62/147頁
文件大小: 1087K
代理商: M34556M8-XXXFP
Rev.3.02
Dec 22, 2006
page 19 of 142
REJ03B0025-0302
4556 Group
PROGRAM MEMORY (ROM)
The program memory is a mask ROM. 1 word of ROM is composed
of 10 bits. ROM is separated every 128 words by the unit of page
(addresses 0 to 127). Table 1 shows the ROM size and pages. Fig-
ure 10 shows the ROM map of M34556ED.
Table 1 ROM size and pages
Part number
M34556M4
M34556M4H
M34556M8
M34556M8H
M34556G8
M34556G8H
ROM (PROM) size
( 10 bits)
4096 words
8192 words
Pages
32 (0 to 31)
64 (0 to 63)
A part of page 1 (addresses 008016 to 00FF16) is reserved for in-
terrupt addresses (Figure 11). When an interrupt occurs, the
address (interrupt address) corresponding to each interrupt is set
in the program counter, and the instruction at the interrupt address
is executed. When using an interrupt service routine, write the in-
struction generating the branch to that routine at an interrupt
address.
Page 2 (addresses 010016 to 017F16) is the special page for sub-
routine calls. Subroutines written in this page can be called from
any page with the 1-word instruction (BM). Subroutines extending
from page 2 to another page can also be called with the BM in-
struction when it starts on page 2.
ROM pattern (bits 7 to 0) of all addresses can be used as data ar-
eas with the TABP p instruction.
Fig. 10 ROM map of M34556M8/M8H/G8/G8H
Fig. 11 Page 1 (addresses 008016 to 00FF16) structure
9876543210
Interrupt address page
0000
008016
16
017F16
Subroutine special page
007F
00FF16
010016
1FFF16
018016
Page 1
Page 2
Page 0
Page 3
Page 63
90
8765
432
1
External 0 interrupt address
008016
008216
008416
Timer 1 interrupt address
Timer 2 interrupt address
008616
008816
008A16
008C16
008E16
00FF16
Timer 3 interrupt address
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