III PERIPHERAL BLOCK: 8-BIT PROGRAMMABLE TIMERS
S1C33L03 FUNCTION PART
EPSON
B-III-3-9
A-1
B-III
8TM
High-speed DMA
The underflow interrupt factor of the timer 0 to 3 can also invoke high-speed DMA (HSDMA).
The following shows the HSDMA channel number and trigger set-up bit corresponding to the timer 0 to 3:
Table 3.5 HSDMA Trigger Set-up Bits
Timer
HSDMA channel
Trigger set-up bits
Timer 0
0
HSD0S[3:0] (D[3:0]) / HSDMA Ch.0/1 trigger set-up register (0x40298)
Timer 1
1
HSD1S[3:0] (D[7:4]) / HSDMA Ch.0/1 trigger set-up register (0x40298)
Timer 2
2
HSD2S[3:0] (D[3:0]) / HSDMA Ch.2/3 trigger set-up register (0x40299)
Timer 3
3
HSD3S[3:0] (D[7:4]) / HSDMA Ch.2/3 trigger set-up register (0x40299)
For HSDMA to be invoked, the trigger set-up bits should be set to "0101" in advance. Transfer conditions, etc.
must also be set on the HSDMA side.
If the 8-bit timer is selected as the HSDMA trigger, the HSDMA channel is invoked through generation of
the interrupt factor.
For details on HSDMA transfer, refer to "HSDMA (High-Speed DMA)".
Trap vectors
The trap vector addresses for individual underflow interrupt factors are set by default as shown below:
Timer 0 underflow interrupt: 0x0C000D0
Timer 1 underflow interrupt: 0x0C000D4
Timer 2 underflow interrupt: 0x0C000D8
Timer 3 underflow interrupt: 0x0C000DC
The base address of the trap table can be changed using the TTBR register (0x48134 to 0x48137).
Summary of Contents for CMOS 32-Bit Single Chip Microcomputer S1C33L03
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