参数资料
型号: M306K9F8LRP
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 16 MHz, MICROCONTROLLER, PQFP144
封装: 16 X 16 MM, 0.40 MM PITCH, PLASTIC, TQFP-144
文件页数: 42/101页
文件大小: 2590K
代理商: M306K9F8LRP
Rev.1.00
Jun 06, 2003
page 28 of 290
M16C/6K9 Group
(1) Software wait
A software wait can be inserted by setting the wait bit (bit 7) of the processor mode register 1 (address
000516) (Note) .
A software wait is inserted in the internal ROM/RAM area by setting the wait bit of the processor mode
register 1. When set to “0”, each bus cycle is executed in one BCLK cycle. When set to “1”, each bus cycle
is executed in 2 BCLK cycles. After the microcomputer has been reset, this bit defaults to “0”.
Set this bit after referring to the recommended operating conditions (main clock input oscillation frequency)
of the electric characteristics.
The SFR area is always accessed in two BCLK cycles regardless of the setting of these control bits.
Table.EF-1 shows the software wait and bus cycles. Fig.EF-1 shows example bus timing when using soft-
ware waits.
Note: Before attempting to change the contents of the processor mode register 1, set bit 1 of the protect
register (address 000A16) to “1”.
Table.EF-1 Software waits and bus cycles
Bus control
Area
Wait bit
Bus cycle
1
2 BCLK cycles
SFR
Internal
ROM/RAM
0
1 BCLK cycle
Invalid
2 BCLK cycles
Bus control
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