M16C30P_07 Datasheet, PDF (131/317 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/30 SERIES

M16C/30P Group
14. Timers
Timer Bi Mode Register (i=0 to 2)
b7 b6 b5 b4 b3 b2 b1 b0
01
Symbol
Address
After Reset
TB0MR to TB2MR
039Bh to 039Dh
00XX0000b
Bit Symbol
Bit Name
Function
RW
TMOD0 Operation Mode Select Bit
b1 b0
RW
TMOD1
0 1 : Event counter mode
RW
Count Polarity Select Bit ⁽¹⁾
b3 b2
MR0
0 0 : Counts falling edges of external signal
RW
0 1 : Counts rising edges of external signal
1 0 : Counts falling and rising edges
MR1
external signal
RW
1 1 : Do not set to this value
TB0MR register
Set to “0” in event counter mode
RW
MR2
TB1MR, TB2MR registers
Nothing is assigned. When w rite, set to “0”.
—
When read, its content is indeterminate.
When w rite in event counter mode, set to “0”.
MR3 _{When read in event counter mode, its content is indeterminate.}
RO
Has no effect in event counter mode.
TCK0 _{Can be set to “0” or “1”.}
RW
Event Clock Select
0 : Input from TBiIN pin ⁽²⁾
TCK1
1 : TBj overflow or underflow
RW
(j = i – 1, how ever, j = 2 if i = 0)
NOTES :
1. Effective w hen the TCK1 bit = 0 (input from TBiIN pin). If the TCK1 bit = 1 (TBj overflow or underflow ), these bits can
be set to “0” or “1”.
2. The port direction bit for the TBiIN pin must be set to “0” (= input mode).
Figure 14.19 TBiMR Register in Event Counter Mode
Rev.1.22 Mar 29, 2007 Page 115 of 291
REJ09B0179-0122