PIC18F2221-I/ML Microchip Technology, PIC18F2221-I/ML Datasheet - Page 171

• Manufacturer Part Number: PIC18F2221-I/ML
• Description: IC PIC MCU FLASH 2KX16 28QFN
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F2221-I/ML

• Core Size: 8-Bit
• Program Memory Size: 4KB (2K x 16)
• Core Processor: PIC
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 25
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 10x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Controller Family/series: PIC18
• No. Of I/o's: 25
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 512Byte
• Cpu Speed: 40MHz
• No. Of Timers: 4
• Package: 28QFN EP
• Device Core: PIC
• Family Name: PIC18
• Maximum Speed: 40 MHz
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 25
• Interface Type: I2C/SPI/USART
• On-chip Adc: 10-chx10-bit
• Number Of Timers: 4
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT28QFN4 - SOCKET TRANS ICE 28QFN W/CABLEAC164322 - MODULE SOCKET MPLAB PM3 28/44QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

17.3.8
In SPI Master mode, module clocks may be operating
at a different speed than when in full power mode. In
the case of Sleep mode, all clocks are halted.
In Idle modes, a clock is provided to the peripherals.
That clock should be from the primary clock source, the
secondary clock (Timer1 oscillator at 32.768 kHz) or
the INTOSC source. See Section 2.7 “Clock Sources
and Oscillator Switching” for additional information.
In most cases, the speed that the master clocks SPI
data is not important; however, this should be
evaluated for each system.
If MSSP interrupts are enabled, they can wake the
controller from Sleep mode, or one of the Idle modes,
when the master completes sending data. If an exit
from Sleep or Idle mode is not desired, MSSP
interrupts should be disabled.
If the Sleep mode is selected, all module clocks are
halted and the transmission/reception will remain in
that state until the devices wakes. After the device
returns to Run mode, the module will resume
transmitting and receiving data.
In SPI Slave mode, the SPI Transmit/Receive Shift
register operates asynchronously to the device. This
allows the device to be placed in any power-managed
mode and data to be shifted into the SPI Transmit/
Receive Shift register. When all 8 bits have been
received, the MSSP interrupt flag bit will be set and if
enabled, will wake the device.
TABLE 17-2:
© 2007 Microchip Technology Inc.
INTCON
PIR1
PIE1
IPR1
TRISA
TRISC
SSPBUF
SSPCON1
SSPSTAT
Legend: Shaded cells are not used by the MSSP in SPI mode.
Note 1:
Name
2:
These bits are unimplemented on 28-pin devices and read as ‘0’.
PORTA<7:6> and their direction bits are individually configured as port pins based on various primary
oscillator modes. When disabled, these bits read as ‘0’.
OPERATION IN POWER-MANAGED
MODES
PORTC Data Direction Control Register
MSSP Receive Buffer/Transmit Register
TRISA7
GIE/GIEH PEIE/GIEL TMR0IE
PSPIE
PSPIP
PSPIF
WCOL
Bit 7
SMP
REGISTERS ASSOCIATED WITH SPI OPERATION
(1)
(1)
(1)
(2)
TRISA6
SSPOV
ADIE
ADIP
Bit 6
ADIF
CKE
(2)
PORTA Data Direction Control Register
SSPEN
RCIE
RCIP
RCIF
Bit 5
D/A
Preliminary
INT0IE
TXIE
TXIP
Bit 4
TXIF
CKP
P
SSPM3
SSPIE
SSPIP
SSPIF
17.3.9
A Reset disables the MSSP module and terminates the
current transfer.
17.3.10
Table 17-1 shows the compatibility between the
standard SPI modes and the states of the CKP and
CKE control bits.
TABLE 17-1:
There is also an SMP bit which controls when the data
is sampled.
RBIE
Bit 3
PIC18F4321 FAMILY
S
Standard SPI Mode
Terminology
0, 0
0, 1
1, 0
1, 1
TMR0IF
CCP1IF
CCP1IE
CCP1IP
SSPM2
EFFECTS OF A RESET
BUS MODE COMPATIBILITY
Bit 2
R/W
SPI BUS MODES
TMR2IE
TMR2IP
TMR2IF
SSPM1
INT0IF
Bit 1
UA
Control Bits State
CKP
0
0
1
1
TMR1IF
TMR1IE
TMR1IP
SSPM0
RBIF
Bit 0
DS39689E-page 169
BF
on page
CKE
Values
Reset
1
0
1
0
49
52
52
52
52
52
50
50
50