mc68hc908lb8 Freescale Semiconductor, Inc, mc68hc908lb8 Datasheet - Page 105

• Manufacturer Part Number: mc68hc908lb8
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

10.8 HRP Registers
The following registers control and monitor operation of the HRP:
10.8.1 HRP Control Register
The HRPCTRL register does the following:
SHTLVL — SHTDWN Pin Level
HRPOE — HRP Output Enable
SHTIF — SHTDWN Interrupt Flag
SHTIE — SHTDWN Interrupt Enable
SHTEN — Shutdown Pin Enable
Freescale Semiconductor
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This read-only bit contains the current logic level of the SHTDWN pin. Reset clears the SHTLVL bit.
This read/write bit enables/disables the TOP and BOT output pins.
This read/write bit is set when a falling edge or a low level is detected on the SHTDWN pin. Reset
clears the SHTIF bit. Writing 0 to SHTIF clears the bit.
This read/write bit enables HRP CPU interrupt service requests for the SHTDWN pin. Reset clears the
SHTIE bit.
1 = Pins PTB0/TOP and PTB1/BOT function as TOP and BOT outputs from the HRP module. The
0 = Pins PTB0/TOP and PTB1/BOT function as PTB0 and PTB1 general-purpose I/O pins. The
1 = SHTDWN pin interrupt pending
0 = No SHTDWN pin interrupt pending
1 = SHTDWN CPU interrupt requests enabled
0 = SHTDWN CPU interrupt requests disabled
HRP control register (HRPCTRL)
HRP duty cycle registers (HRPDCH: HRPDCL)
HRP period registers (HRPPERH:HRPPERL)
HRP deadtime register (HRPDT)
HRP timebase registers (HRPTBH:HRPTBL)
Enables the HRP
Controls the operating mode of the HRP
Enables the SHTDWN, TOP, and BOT pins
Enables interrupt functionality for the SHTDWN pin
contents of the port B data and data direction registers do not affect these pins.
state of these pins is controlled by the port B data and data direction registers.
Address: $0051
Reset:
Read:
Write:
Bit 7
Figure 10-10. HRP Control Register (HRPCTRL)
= Unimplemented
SHTLVL
6
0
MC68HC908LB8 Data Sheet, Rev. 1
HRPOE
5
0
SHTIF
4
0
SHTIE
3
0
SHTEN
2
0
MODE
HRP-
1
0
HRPEN
Bit 0
0
HRP Registers
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