Section 13 8-Bit Timer (TMR)
Rev. 3.00 Jan 25, 2006 page 335 of 872
REJ09B0286-0300
13.6
TMR_0 and TMR_1 Cascaded Connection
If bits CKS2 to CKS0 in either TCR_0 or TCR_1 are set to B'100, the 8-bit timers of the two
channels are cascaded. With this configuration, a single 16-bit timer can be used (16-bit count
mode) or the compare-matches of the 8-bit timer of channel 0 can be counted by the 8-bit timer of
channel 1 (compare-match count mode).
13.6.1
16-Bit Count Mode
When bits CKS2 to CKS0 in TCR_0 are set to B'100, the timer functions as a single 16-bit timer
with channel 0 occupying the upper 8 bits and channel 1 occupying the lower 8 bits.
•
Setting of compare-match flags
The CMF flag in TCSR_0 is set to 1 when a 16-bit compare-match occurs.
The CMF flag in TCSR_1 is set to 1 when a lower 8-bit compare-match occurs.
•
Counter clear specification
If the CCLR1 and CCLR0 bits in TCR_0 have been set for counter clear at compare-match,
the 16-bit counter (TCNT_0 and TCNT_1 together) is cleared when a 16-bit compare-
match occurs. The 16-bit counter (TCNT_0 and TCNT_1 together) is also cleared when
counter clear by the TMI0 pin has been set.
The settings of the CCLR1 and CCLR0 bits in TCR_1 are ignored. The lower 8 bits cannot
be cleared independently.
•
Pin output
Control of output from the TMO0 pin by bits OS3 to OS0 in TCSR_0 is in accordance with
the 16-bit compare-match conditions.
Control of output from the TMO1 pin by bits OS3 to OS0 in TCSR_1 is in accordance with
the lower 8-bit compare-match conditions.
13.6.2
Compare-Match Count Mode
When bits CKS2 to CKS0 in TCR_1 are B'100, TCNT_1 counts the occurrence of compare-match
A for channel 0. Channels 0 and 1 are controlled independently. Conditions such as setting of the
CMF flag, generation of interrupts, output from the TMO pin, and counter clearing are in
accordance with the settings for each channel.
Summary of Contents for H8S/2158
Page 10: ...Rev 3 00 Jan 25 2006 page viii of lii...
Page 36: ...Rev 3 00 Jan 25 2006 page xxxiv of lii B Product Lineup 863 C Package Dimensions 864 Index 865...
Page 47: ...Rev 3 00 Jan 25 2006 page xlv of lii Appendix Figure C 1 Package Dimensions TBP 112A 864...
Page 54: ...Rev 3 00 Jan 25 2006 page lii of lii...
Page 70: ...Section 1 Overview Rev 3 00 Jan 25 2006 page 16 of 872 REJ09B0286 0300...
Page 118: ...Section 3 MCU Operating Modes Rev 3 00 Jan 25 2006 page 64 of 872 REJ09B0286 0300...
Page 126: ...Section 4 Exception Handling Rev 3 00 Jan 25 2006 page 72 of 872 REJ09B0286 0300...
Page 198: ...Section 6 Bus Controller Rev 3 00 Jan 25 2006 page 144 of 872 REJ09B0286 0300...
Page 326: ...Section 10 8 Bit PWM Timer PWM Rev 3 00 Jan 25 2006 page 272 of 872 REJ09B0286 0300...
Page 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Page 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
Page 742: ...Section 19 Multimedia Card Interface MCIF Rev 3 00 Jan 25 2006 page 688 of 872 REJ09B0286 0300...
Page 750: ...Section 21 D A Converter Rev 3 00 Jan 25 2006 page 696 of 872 REJ09B0286 0300...
Page 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Page 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
Page 824: ...Section 26 Clock Pulse Generator Rev 3 00 Jan 25 2006 page 770 of 872 REJ09B0286 0300...
Page 844: ...Section 27 Power Down Modes Rev 3 00 Jan 25 2006 page 790 of 872 REJ09B0286 0300...
Page 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Page 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...