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参数资料
| 型号： | M306V8FJFP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP116 |
| 封装： | 20 X 20 MM, 0.65 MM PITCH, PLASTIC, LQFP-116 |
| 文件页数： | 24/77页 |
| 文件大小： | 2650K |
| 代理商： | M306V8FJFP |
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M306V8FJFP
Rev.1.31
Apr 18, 2005
page 28 of 363
REJ03B0082-0131
Processor Mode
(1) Types of Processor Mode
Three processor modes are available to choose from: single-chip mode, memory expansion mode, and
microprocessor mode. Table 4.1 shows the features of these processor modes.
(2) Setting Processor Modes
Processor mode is set by using the CNVSS1 pin and the PM01 to PM00 bits in the PM0 register.
Table 4.2 shows the processor mode after hardware reset. Table 4.3 shows the PM01 to PM00 bit set
values and processor modes.
Table 4.2. Processor Mode After Hardware Reset
Table 4.1. Features of Processor Modes
Processor modes
Access space
Pins which are assigned I/O ports
Single-chip mode
SFR, internal RAM, internal ROM,
OSDRAM, OSDROM
All pins are I/O ports or peripheral
function I/O pins
Memory expansion mode
SFR, internal RAM, internal ROM,
external area (Note),
OSDRAM, OSDROM
Some pins serve as bus control pins (Note)
Microprocessor mode
SFR, internal RAM, external area (Note),
OSDRAM, OSDROM
Some pins serve as bus control pins (Note)
Note : Refer to “Bus”.
CNVSS1 pin input level
Processor mode
VSS
Single-chip mode
VCC1 (Note 1, Note 2)
Microprocessor mode
Note 1: If the microcomputer is reset in hardware by applying VCC1 to the CNVSS1 pin (hardware reset 1
or hardware reset 2), the internal ROM cannot be accessed regardless of PM01 to PM00 bits.
Note 2: The multiplexed bus cannot be assigned to the entire CS space.
Table 4.3. PM01 to PM00 Bits Set Values and Processor Modes
PM01 to PM00 bits
Processor modes
Single-chip mode
Memory expansion mode
Must not be set
002
012
102
Microprocessor mode
112
Rewriting the PM01 to PM00 bits places the microcomputer in the corresponding processor mode regard-
less of whether the input level on the CNVSS1 pin is “H” or “L”. Note, however, that the PM01 to PM00 bits
cannot be rewritten to “012” (memory expansion mode) or “112” (microprocessor mode) at the same time
the PM07 to PM02 bits are rewritten. Note also that these bits cannot be rewritten to enter microprocessor
mode in the internal ROM, nor can they be rewritten to exit microprocessor mode in areas overlapping the
internal ROM.
If the microcomputer is reset in hardware by applying VCC1 to the CNVSS1 pin (hardware reset 1 or
hardware reset 2), the internal ROM cannot be accessed regardless of PM01 to PM00 bits.
Figures 4.1 and 4.2 show the registers associated with processor modes. Figure 4.3 show the memory
map in single chip mode.
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