Data Register - Fujitsu MB90390 Series Hardware Manual

13.3.1

Data Register

The data register can read the count value of the 16-bit free-run timer. The counter value
is cleared to "0000
register. However, ensure that the value is written while the operation is stopped
(STOP=1).
The data register must be accessed by the word access instructions.
■ Data Register of Free-run Timer
Address:
bit
15 14
352C
H
Tn15 Tn14
352D
H
353C
R/W R/W R/W R/W R/W
H
353D
H
R/W : Readable and writable
The 16-bit free-run timer is initialized upon the following factors:
• Reset
• Clear bit (CLR) of control status register
• Free-run timer 0: A match between compare register 0 and the timer counter value.
• Free-run timer 1: A match between compare register 4 and the timer counter value.
" upon a reset. The timer value can be set by writing a value to this
B
Figure 13.3-2 Data Register of Free-run Timer (TCDT0/TCDT1)
13 12 11 10 9 8
Tn13 Tn12 Tn11 Tn10 Tn9 Tn8
R/W R/W R/W
7 6 5 4 3 2
Tn7 Tn6 Tn5 Tn4 Tn3 Tn2 Tn1
R/W R/W R/W R/W R/W R/W R/W R/W
CHAPTER 13 16-BIT I/O TIMER
1 0
TCDT0/TCDT1
Tn0
Initial value
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
bit0 to bit7
lower bits
TCDT0/TCDT1
Tn0 Timer Data Reg. 0
Tn1 Timer Data Reg. 1
Tn2 Timer Data Reg. 2
Tn3 Timer Data Reg. 3
Tn4 Timer Data Reg. 4
Tn5 Timer Data Reg. 5
Tn6 Timer Data Reg. 6
Tn7 Timer Data Reg. 7
n = 0, 1
bit8 to bit15
upper bits
TCDT0/TCDT1
Tn8 Timer Data Reg. 8
Tn9 Timer Data Reg. 9
Tn10 Timer Data Reg. 10
Tn11 Timer Data Reg. 11
Tn12 Timer Data Reg. 12
Tn13 Timer Data Reg. 13
Tn14 Timer Data Reg. 14
Tn15 Timer Data Reg. 15
n = 0, 1
B
197