Fujitsu FR81S 사용자 설명서
CHAPTER 19: BASE TIMER
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: BASE TIMER
FUJITSU SEMICONDUCTOR CONFIDENTIAL
35
4.5.1. Status Control Registers 0, 1 : BTxSTC (Base Timer
0/1 STatus Control)
The bit configuration of status control registers 0, 1 (BTxSTC) is shown below.
These registers control interrupt requests.
Notes:
⋅
Reserved bits must be set to "0".
⋅
For the read-modify-write instruction to OVIR, "1" is read out.
⋅
These registers must be accessed in 8-bit mode.
⋅
These registers will also be initialized when reset mode is set (writing of BTxTMCR:FMD= 000).
BTxSTC : Address Base_addr + 05
H
(Access: Byte)
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
ERR
EDIE
Reserved
OVIE
Reserved
EDIR
Reserved
OVIR
Initial value
0
0
0
0
0
0
0
0
Attribute R,W0
R/W
R0,W0
R/W
R0,W0
R,WX
R0,W0
R(RM1),
W
[bit7] ERR (ERRor) : Error flag bit
This bit indicates that the next measurement is completed before the measurement result is read from the data
buffer register (BTxDTBF) in the continuous measurement mode and the measurement result has been
overwritten by the new value. The old value is discarded. This bit is cleared to "0" when a value is read from
the data buffer register (BTxDTBF).
ERR
Description
0
The measurement result has not been overwritten.
1
The measurement result has been overwritten.
[bit6] EDIE (EnD Interrupt Enable) : Measurement completion interrupt request enable bit
This bit sets whether or not to generate a measurement completion interrupt request when the measurement of
the 16/32-bit PWC timer is completed (EDIR = 1).
[bit4] OVIE (OVerflow Interrupt Enable) : Overflow interrupt request enable bit
This bit sets whether or not to generate an overflow interrupt request when the up counter overflows (OVIR =
1).
EDIE/OVIE
Description
0
Disabled
1
Enabled
MB91520 Series
MN705-00010-1v0-E
668