Fujitsu FR81S User Manual
CHAPTER 19: BASE TIMER
4. Registers
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER
: BASE TIMER
FUJITSU SEMICONDUCTOR CONFIDENTIAL
31
4.4.1. 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 TGIR and UDIR, "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
Reserved
TGIE
Reserved
UDIE
Reserved
TGIR
Reserved
UDIR
Initial value
0
0
0
0
0
0
0
0
Attribute R0,W0
R/W
R0,W0
R/W
R0,W0 R(RM1),W R0,W0 R(RM1),W
[bit6] TGIE (TriGger Interrupt Enable) : Trigger interrupt request enable bit
This bit sets whether or not to generate a trigger interrupt request when a 16-bit PPG timer activation trigger is
detected (TGIR = 1).
[bit4] UDIE (UnDerflow Interrupt Enable) : Underflow interrupt request enable bit
This bit sets whether or not to generate an underflow interrupt request when the base timer x H width setting
reload register (BTxPRLH) completed counting down and the counter underflows (UDIR = 1).
TGIE/UDIE
Description
0
Disabled.
1
Enabled.
[bit2] TGIR (TriGger Interrupt Register) : Trigger interrupt request flag bit
This bit indicates that a 16-bit PPG timer activation trigger is detected. When this bit is "1" and the TGIE bit is
set to "1", a trigger interrupt request is generated.
[bit0] UDIR (UnDerflow Interrupt Register) : Underflow interrupt request flag bit
This bit indicates that the base timer x H width setting reload register (BTxPRLH) completed counting down
and an underflow occurred. An underflow will occur if the register attempts counting down when the 16-bit
down counter value is "0000
H
". When this bit is "1" and the UDIE bit is set to "1", an underflow interrupt
request is generated.
TGIR/UDIR
Read
Write
0
No trigger detection/underflow occurred.
This bit is cleared.
1
Trigger detection/underflow occurred.
No effect on the operation.
MB91520 Series
MN705-00010-1v0-E
664