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| 型号： | UPD70F3261YGF-JBT-A |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 32 MHz, MICROCONTROLLER, PQFP100 |
| 封装： | 14 X 20 MM, PLASTIC, QFP-100 |
| 文件页数： | 122/129页 |
| 文件大小： | 8549K |
| 代理商： | UPD70F3261YGF-JBT-A |
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CHAPTER 3 CPU FUNCTION
User’s Manual U16541EJ5V1UD
92
(3) System status register (SYS)
Status flags that indicate the operation status of the overall system are allocated to this register.
This register can be read or written in 8-bit or 1-bit units.
Reset sets this register to 00H.
0
Protection error did not occur
Protection error occurred
PRERR
0
1
Detects protection error
SYS
0
PRERR
After reset: 00H
R/W
Address: FFFFF802H
< >
The PRERR flag operates under the following conditions.
(a) Set condition (PRERR flag = 1)
(i)
When data is written to a special register without writing anything to the PRCMD register (when <4> is
executed without executing <3> in 3.4.8 (1) Setting data to special registers)
(ii) When data is written to an on-chip peripheral I/O register other than a special register (including
execution of a bit manipulation instruction) after writing data to the PRCMD register (if <4> in 3.4.8 (1)
Setting data to special registers is not the setting of a special register)
Remark
Even if an on-chip peripheral I/O register is read (except by a bit manipulation instruction)
between an operation to write the PRCMD register and an operation to write a special register,
the PRERR flag is not set, and the set data can be written to the special register.
(b) Clear condition (PRERR flag = 0)
(i)
When 0 is written to the PRERR flag
(ii) When the system is reset
Cautions 1. If 0 is written to the PRERR bit of the SYS register, which is not a special register,
immediately after a write access to the PRCMD register, the PRERR bit is cleared to 0
(the write access takes precedence).
2. If data is written to the PRCMD register, which is not a special register, immediately
after a write access to the PRCMD register, the PRERR bit is set to 1.
<R>
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