Section 11 8-Bit Timer (TMR)
Rev. 1.00 Mar. 12, 2008 Page 394 of 1178
REJ09B0403-0100
11.2 Register
Descriptions
The TMR has the following registers for each channel. For details on the serial timer control
register, see section 3.2.3, Serial Timer Control Register (STCR).
•
Timer counter (TCNT)
•
Time constant register A (TCORA)
•
Time constant register B (TCORB)
•
Timer control register (TCR)
•
Timer control/status register (TCSR)
•
Timer connection register S (TCONRS)*
Notes:
Some of the registers of TMR_X and TMR_Y use the same address. The registers can
be switched by the TMRX/Y bit in TCONRS.
* TCONRS is only provided for TMR_X
11.2.1
Timer Counter (TCNT)
Each TCNT is an 8-bit readable/writable up-counter. TCNT_0 and TCNT_1 comprise a single 16-
bit register, so they can be accessed together by word access. The clock source is selected by the
CKS2 to CKS0 bits in TCR. TCNT can be cleared by a compare-match A signal or compare-
match B signal. The method of clearing can be selected by the CCLR1 and CCLR0 bits in TCR.
When TCNT overflows (changes from H'FF to H'00), the OVF bit in TCSR is set to 1. TCNT is
initialized to H'00.
TCNT_Y can be accessed when the TMRX/Y bit in TCONRS is 1. TCNT_X can be accessed
when the TMRX/Y bit in TCONRS is 0. See section 11.2.6, Timer Connection Register S
(TCONRS).
Summary of Contents for H8S Family
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Page 70: ...Section 1 Overview Rev 1 00 Mar 12 2008 Page 22 of 1178 REJ09B0403 0100...
Page 108: ...Section 2 CPU Rev 1 00 Mar 12 2008 Page 60 of 1178 REJ09B0403 0100...
Page 116: ...Section 3 MCU Operating Modes Rev 1 00 Mar 12 2008 Page 68 of 1178 REJ09B0403 0100...
Page 152: ...Section 5 Interrupt Controller Rev 1 00 Mar 12 2008 Page 104 of 1178 REJ09B0403 0100...
Page 206: ...Section 6 Bus Controller BSC Rev 1 00 Mar 12 2008 Page 158 of 1178 REJ09B0403 0100...
Page 420: ...Section 9 14 Bit PWM Timer PWMX Rev 1 00 Mar 12 2008 Page 372 of 1178 REJ09B0403 0100...
Page 476: ...Section 12 Watchdog Timer WDT Rev 1 00 Mar 12 2008 Page 428 of 1178 REJ09B0403 0100...
Page 552: ...Section 14 CRC Operation Circuit CRC Rev 1 00 Mar 12 2008 Page 504 of 1178 REJ09B0403 0100...
Page 712: ...Section 18 I2 C Bus Interface IIC Rev 1 00 Mar 12 2008 Page 664 of 1178 REJ09B0403 0100...
Page 804: ...Section 19 LPC Interface LPC Rev 1 00 Mar 12 2008 Page 756 of 1178 REJ09B0403 0100...
Page 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
Page 964: ...Section 24 RAM Rev 1 00 Mar 12 2008 Page 916 of 1178 REJ09B0403 0100...
Page 1066: ...Section 25 Flash Memory Rev 1 00 Mar 12 2008 Page 1018 of 1178 REJ09B0403 0100...
Page 1098: ...Section 26 Boundary Scan JTAG Rev 1 00 Mar 12 2008 Page 1050 of 1178 REJ09B0403 0100...
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