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PDF MC68HC912BL16 Data sheet ( Hoja de datos )
| Número de pieza | MC68HC912BL16 | |
| Descripción | 16-Bit Microcontroller | |
| Fabricantes | Freescale Semiconductor | |
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Freescale Semiconductor, Inc. Order this document
by MC68HC912BL16TS/D
MC68HC912BL16
Technical Summary
16-Bit Microcontroller
1 Introduction
The MC68HC912BL16 microcontroller unit (MCU) is a 16-bit device composed of standard on-chip pe-
ripherals including a 16-bit central processing unit (CPU12), 16-Kbyte flash EEPROM, 512-byte RAM,
512-byte EEPROM, an asynchronous serial communications interface (SCI), a serial peripheral inter-
face (SPI), an 7-channel timer and 16-bit pulse accumulator, an 10-bit analog-to-digital converter
(ADC), and a four-channel pulse-width modulator (PWM). System resource mapping, clock generation,
interrupt control and bus interfacing are managed by the Lite integration module (LIM). The
MC68HC912BL16 has full 16-bit data paths throughout, however, the multiplexed external bus can op-
erate in an 8-bit narrow mode so single 8-bit wide memory can be interfaced for lower cost systems.
1.1 Features
• 16-Bit CPU12
— Upward Compatible with M68HC11 Instruction Set
— Interrupt Stacking and Programmer’s Model Identical to M68HC11
— 20-Bit ALU
— Instruction Queue
— Enhanced Indexed Addressing
— Fuzzy Logic Instructions
• Multiplexed Bus
— Single Chip or Expanded
— 16/16 Wide or 16/8 Narrow Modes
• Memory
— 16-Kbyte Flash EEPROM with 2-Kbyte Erase-Protected Boot Block
— 512-byte EEPROM
— 512-byte RAM with Single-Cycle Access for Aligned or Misaligned Read/Write
• 8-Channel, 10-bit Analog-to-Digital Converter
• 7-Channel Timer
— Each Channel Fully Configurable as Either Input Capture or Output Compare
— Simple PWM Mode
— Modulo Reset of Timer Counter
• 16-Bit Pulse Accumulator
— External Event Counting
— Gated Time Accumulation
• Pulse-Width Modulator
— 8-Bit, 4-Channel or 16-Bit, 2-Channel
— Separate Control for Each Pulse Width and Duty Cycle
— Programmable Center-Aligned or Left-Aligned Outputs
• Serial Interfaces
For MorGeoIntfooP:rRwmEwLaItwMioI.NfnAreROeYnscTahlies.cPoromduct,
REV. 1
1 page  
Freescale Semiconductor, Inc.
1.3 MC68HC912BL16 Block Diagram
VFP
BKGD
EXTAL
XTAL
RESET
PE0
PE1
PE2
PE3
PE4
PE5
PE6
PE7
16-KBYTE FLASH EEPROM
512-BYTE RAM
512-BYTE EEPROM
CPU12
SMODN / TAGHI
SINGLE-WIRE
BACKGROUND
DEBUG MODULE
PERIODIC INTERRUPT
COP WATCHDOG
CLOCK MONITOR
BREAK POINTS
XIRQ
IRQ
R/W
LSTRB / TAGLO
ECLK
IPIPE0 / MODA
IPIPE1 / MODB
DBE
LITE
INTEGRATION
MODULE
(LIM)
MULTIPLEXED ADDRESS/DATA BUS
ATD
CONVERTER
AN0
AN1
AN2
AN3
AN4
AN5
AN6
AN7
IOC0
IOC1
IOC2
TIMER AND
IOC3
PULSE OC7 IOC4
ACCUMULATOR IOC5
IOC6
PAI
SCI
RxD
TxD
SDI/MISO
SDO/MOSI
SPI SCK
CS/SS
PWM
PW0
PW1
PW2
PW3
VRH
VRL
VDDA
VSSA
DDRA
PORT A
DDRB
PORT B
VRH
VRL
VDDA
VSSA
PAD0
PAD1
PAD2
PAD3
PAD4
PAD5
PAD6
PAD7
PT0
PT1
PT2
PT3
PT4
PT5
PT7
PS0
PS1
PS4
PS5
PS6
PS7
PP0
PP1
PP2
PP3
WIDE
BUS
NARROW BUS
VDD × 1
VSS × 1
POWER FOR
INTERNAL
CIRCUITRY
VDDX × 2
VSSX × 2
POWER FOR
I/O DRIVERS
Figure 1 MC68HC912BL16 Block Diagram
MC68HC912BL16TS/D
For More Information On This Product,
Go to: www.freescale.com
5
5 Page 
Freescale Semiconductor, Inc.
EXTAL
MCU
XTAL
10 MΩ
C
2xE
CRYSTAL
C
Figure 4 Common Crystal Connections
COMMON XTAL CONN
EXTAL
MCU
XTAL NC
2xE
CMOS-COMPATIBLE
EXTERNAL OSCILLATOR
Figure 5 External Oscillator Connections
EXT EXTAL CONN
XTAL is the crystal output. The XTAL pin must be left unterminated when an external CMOS compatible
clock input is connected to the EXTAL pin. The XTAL output is normally intended to drive only a crystal.
The XTAL output can be buffered with a high-impedance buffer to drive the EXTAL input of another de-
vice.
In all cases take extra care in the circuit board layout around the oscillator pins. Load capacitances
shown in the oscillator circuits include all stray layout capacitances. Refer to Figure 4 and Figure 5 for
diagrams of oscillator circuits.
3.3.2 E-Clock Output (ECLK)
ECLK is the output connection for the internal bus clock and is used to demultiplex the address and data
and is used as a timing reference. ECLK frequency is equal to 1/2 the crystal frequency out of reset.
In normal single-chip mode the E-clock output is off at reset to reduce the effects of RFI but can be
turned on if necessary.
In special single-chip mode the E-clock output is on at reset but can be turned off.
In special peripheral mode the E clock is an input to the MCU.
All clocks, including the E-clock, are halted when the MCU is in STOP mode. It is possible to configure
the MCU to interface to slow external memory. ECLK can be stretched for such accesses.
MC68HC912BL16TS/D
For More Information On This Product,
Go to: www.freescale.com
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