16-Bit Timer Register 0 (Tmr0)/16-Bit Reload Register 0 (Tmrlr0) - Fujitsu MB90335 Series Hardware Manual

MB90335 Series
14.2.2 16-bit Timer Register 0 (TMR0)/16-bit Reload Register 0
(TMRLR0)
Configuration and functions of 16-bit timer registers 0 (TMR0)/16-bit reload registers 0
(TMRLR0) are described.

■ 16-bit Timer Register 0 (TMR0)/16-bit Reload Register 0 (TMRLR0)

Figure 14.2-3 shows the bit configuration of 16-bit timer registers 0 (TMR0)/16-bit reload registers
(TMRLR0).
Figure 14.2-3 Bit Configuration of 16-bit Timer Registers 0 (TMR0)/16-bit Reload Registers 0 (TMRLR0)
ch.0 : 000065
ch.0 : 000064
■ 16-bit Timer Register 0 (TMR0)
This register can read the counter value of 16-bit down counter. When the counter operation is permitted
(CNTE = 1 for TMCSR0) and the count operation is started, the value written in the 16-bit reload register is
loaded to the registers TMR0 and the count down is started. In the count stop status (CNTE = 0 for
TMCSR0), the TMR0 register value is held.
Note:
Always use the word transfer instruction (MOVW A, 003AH, etc.) when reading the TMR0 register
that is enabled during the counter operation.
The 16-bit timer register (TMR0) has a read-only function despite its location at the same address as
the write-only 16-bit reload register (TMRLR0). Therefore, the write process does not affect the
TMR0 value but the TMRLR0 is written.
CM44-10137-6E
bit 15 14 13 12
D15 D14 D13 D12
H
(R) (R) (R) (R)
(W) (W) (W) (W)
(X) (X) (X) (X)
bit 7 6 5 4
D07 D06 D05 D04
H
(R) (R) (R) (R)
(W) (W) (W) (W)
(X) (X) (X) (X)
FUJITSU MICROELECTRONICS LIMITED
CHAPTER 14 16-BIT RELOAD TIMER
14.2 Registers of 16-bit Reload Timer
11 10 9 8
D11 D10 D09 D08
(R) (R) (R) (R)
(W) (W) (W) (W)
(X) (X) (X) (X)
3 2 1 0
D03 D02 D01 D00
(R) (R) (R) (R)
(W) (W) (W) (W)
(X) (X) (X) (X)
TMR0/TMRLR0
Read (TMR0)
Write (TMRLR0)
Initial value
TMR0/TMRLR0
Read (TMR0)
Write (TMRLR0)
Initial value
327