參數(shù)資料
型號: M37902FGCGP
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
中文描述: 單片16位CMOS微機(jī)
文件頁數(shù): 25/143頁
文件大?。?/td> 1463K
代理商: M37902FGCGP
M37902FCCHP, M37902FGCHP, M37902FJCHP
25
MITSUBISHI MICROCOMPUTERS
SHINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Fig. 17 Bus cycle waveform at access to internal area
1 bus cycle = 3
φ
(Note)
(Internal ROM bus cycle select bit = 0)
ROM
RAM
SFR
Internal address bus
Internal data bus
Internal code bus
φ
BIU
Address
1 bus cycle = 2
φ
φ
BIU
Internal address bus
Internal data bus
Internal code bus
Address
1 bus cycle = 2
φ
1 bus cycle = 2
φ
(Internal ROM bus cycle select bit = 1)
φ
BIU
Internal address bus
Internal data bus
Internal code bus
Address
Data
1 bus cycle = 3
φ
Data
Data
Note:
When reprogramming the internal flash memory in the CPU reprogramming mode, select the bus cycle = 3
φ
.
G
Number of bus cycles
Figure 17 shows the bus cycle waveform at access to the internal
area. Bit 7 of the processor mode register 1 (address 5F
16
) selects
the number of bus cycles for the internal ROM: 3
φ
or 2
φ
. (This bit 7 is
the internal ROM bus cycle select bit.) The internal RAM, SFRs (in-
ternal peripheral devices
control registers) are always accessed with
1 bus cycle = 2
φ
. Figure 18 shows the bus cycle waveform at access
to the external area. The bus cycle select bits 0, 1 (See the note in
Figure 18.) select the number of the bus cycles for each CS
i
area
from 8 types of numbers.
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