Timers

Timers in the WPCM450 are split between five general timers and one watchdog timer. Both are controlled by a block of registers at 0xb8001000.

The timer controller is very similar to the one found in the Winbond W90N745. The main difference is that the WPCM450 has five timers, whereas the W90N745 has only two.

The existing mainline timer driver for NPCM7xx uses the set of registers that is documented in the W90N745 datasheet.

TODO: check TISR w.r.t. different timers

Registers

offset	name	description
00	TCSR0	Timer control and status register 0
04	TCSR1	Timer control and status register 1
08	TICR0	Timer initial control register 0
0c	TICR1	Timer initial control register 1
10	TDR0	Timer data register 0
14	TDR1	Timer data register 1
18	TISR	Timer interrupt status register
1c	WTCR	Watchdog timer control register
20	TCSR2	Timer control and status register 2
24	TCSR3	Timer control and status register 3
28	TICR2	Timer initial control register 2
2c	TICR3	Timer initial control register 3
30	TDR2	Timer data register 2
34	TDR3	Timer data register 3
40	TCSR4	Timer control and status register 4
48	TICR4	Timer initial control register 4
50	TDR4	Timer data register 4

Watchdog Timer

• To reset the system, write 0x82 to 0xb800101c.

References

• Register definitions
• ATEN driver
• Upstream timer driver for NPCM7xx
• Winbond W90N745 datasheet