upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 503
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upd78f0730
Manufacturer Part Number
upd78f0730
Description
8-bit Single-chip Microcontroller
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0730.pdf
(518 pages)
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24.1 Cautions for Wait
may be passed if an access to the CPU conflicts with an access to the peripheral hardware.
processing, until the correct data is passed.
execution clocks of an instruction increases by the number of wait clocks (for the number of wait clocks, see Table 24-
12). This must be noted when real-time processing is performed.
24.2 Peripheral Hardware That Generates Wait
clocks.
Remark The clock is the CPU clock (f
Serial interface
UART6
This product has two internal system buses.
One is a CPU bus and the other is a peripheral bus that interfaces with the low-speed peripheral hardware.
Because the clock of the CPU bus and the clock of the peripheral bus are asynchronous, unexpected illegal data
When accessing the peripheral hardware that may cause a conflict, therefore, the CPU repeatedly executes
As a result, the CPU does not start the next instruction processing but waits. If this happens, the number of
Table 24-1 lists the registers that issue a wait request when accessed by the CPU, and the number of CPU wait
Peripheral
Hardware
Table 24-1. Registers That Generate Wait and Number of CPU Wait Clocks
ASIS6
Register
CHAPTER 24 CAUTIONS FOR WAIT
CPU
Preliminary User’s Manual U19014EJ1V0UD
).
Read
Access
1 clock (fixed)
Number of Wait Clocks
503
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